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Definition of thesis

Did you know.

In high school, college, or graduate school, students often have to write a thesis on a topic in their major field of study. In many fields, a final thesis is the biggest challenge involved in getting a master's degree, and the same is true for students studying for a Ph.D. (a Ph.D. thesis is often called a dissertation ). But a thesis may also be an idea; so in the course of the paper the student may put forth several theses (notice the plural form) and attempt to prove them.

Examples of thesis in a Sentence

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'thesis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

in sense 3, Middle English, lowering of the voice, from Late Latin & Greek; Late Latin, from Greek, downbeat, more important part of a foot, literally, act of laying down; in other senses, Latin, from Greek, literally, act of laying down, from tithenai to put, lay down — more at do

14th century, in the meaning defined at sense 3a(1)

Dictionary Entries Near thesis

the sins of the fathers are visited upon the children

thesis novel

Cite this Entry

“Thesis.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/thesis. Accessed 26 Oct. 2024.

Kids Definition

Kids definition of thesis, more from merriam-webster on thesis.

Nglish: Translation of thesis for Spanish Speakers

Britannica English: Translation of thesis for Arabic Speakers

Britannica.com: Encyclopedia article about thesis

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Thesis or Theses? The Subtle Difference You Can’t Afford to Ignore

Understanding the difference between 'thesis' and 'theses' is essential for students and writers alike. These terms, while similar, have distinct meanings that can impact academic writing. A thesis is a singular statement that presents the main argument of a paper, while theses is the plural form, referring to multiple thesis statements or documents. This article will clarify these terms and provide insights into their significance in academic writing.

Key Takeaways

• A thesis is a single statement that presents the main argument of a paper.
• Theses is the plural form of thesis, referring to multiple statements or documents.
• A strong thesis statement is key to guiding research and structuring an academic paper.
• Common mistakes include using thesis when you mean theses, and vice versa.
• Understanding these terms helps improve clarity in academic writing.

Understanding Thesis vs Theses: A Linguistic Perspective

Defining thesis and theses.

In academic writing, the term thesis refers to a single statement or argument that you present in your work. It is the main idea that you will support throughout your paper. On the other hand, theses is the plural form of thesis, indicating multiple statements or arguments. Understanding this distinction is crucial for clear communication in your writing.

Etymological Roots of the Terms

The word thesis comes from the Greek word "thesis," meaning "a placing" or "a proposition." The plural form, theses , follows the rules of Greek pluralization. This linguistic background helps clarify why these terms are often confused, especially in academic contexts.

Common Misconceptions in Usage

Many people mistakenly use thesis when they mean theses , particularly in discussions about multiple research projects. For example, when discussing various languages, cultures, and linguistics theses , one might say, "In answering these questions, the thesis engages with ideas of utopian working conditions, socialism, and factory life." This confusion can lead to misunderstandings in academic discussions. Similarly, in the field of computational linguistics, thesis collections are essential for finding the latest scholarship, including data sets and detailed research.

To summarize, being aware of the difference between thesis and theses can significantly enhance your academic writing and communication. Here’s a quick reference table:

The Role of Thesis in Academic Writing

Importance of a strong thesis statement.

A strong thesis statement is essential for any academic paper. It serves as the backbone of your work, guiding your arguments and helping to maintain focus. A well-crafted thesis statement not only clarifies your main point but also sets the tone for your entire paper. Remember, a thesis statement should be specific, debatable, and supported by evidence. This clarity is crucial for engaging your readers and ensuring they understand your perspective.

How a Thesis Guides Research

Your thesis acts as a roadmap for your research. It helps you stay on track and avoid unnecessary tangents. By clearly defining your main argument, you can effectively organize your ideas and present a logical flow of thoughts. Here are some key points to consider:

• A thesis statement should be clear and concise.
• It should reflect your unique perspective on the topic.
• It must be arguable, inviting discussion and analysis.

Examples of Effective Thesis Statements

To illustrate the importance of a strong thesis, consider the following examples:

• Weak Thesis : "Social media is bad for society."
• Strong Thesis : "While social media can foster connections, it often leads to increased feelings of isolation and anxiety among users, particularly teenagers."

The second example is more specific and sets the stage for a deeper exploration of the topic.

In summary, investing time in crafting a strong thesis statement is vital for your academic success. It not only enhances the clarity of your writing but also strengthens your overall argument, making your work more impactful and engaging for your audience. For more resources on thesis development, consider visiting [ research rebels® ](https://www.linkedin.com/company/researchrebels) for guidance and support in your academic journey.

Theses: The Plural Form and Its Significance

Understanding the Pluralization

When you refer to more than one thesis, you use the term theses . This is a common point of confusion, but understanding this distinction is crucial for clear communication in academic writing. Using the correct term enhances your credibility as a writer.

When to Use Theses

You should use theses when discussing multiple research projects or documents. For example, if you are comparing findings from different studies, you might say, "The theses presented various perspectives on the topic." This usage is essential in academic discussions, especially when referencing multiple works.

Examples of Theses in Academic Contexts

Here are a few examples to illustrate the use of theses :

• "The theses submitted by the students covered a wide range of topics, from environmental science to social justice."
• "In her review, she analyzed several theses that focused on the impact of technology on education."

By recognizing the significance of the term theses , you can avoid common pitfalls in academic writing. Remember, clarity is key, and using the right terminology helps convey your message effectively. If you ever find yourself unsure, consider reaching out to peers or using platforms like WhatsApp for quick clarification.

Common Errors in Thesis vs Theses Usage

Identifying Misuses in Academic Writing

In academic writing, many students confuse the terms thesis and theses . A common error is using "thesis" when referring to multiple works. Remember, thesis is singular, while theses is the plural form. Misusing these terms can lead to confusion and undermine your credibility as a writer.

Impact of Incorrect Usage on Clarity

Using the wrong term can obscure your message. For instance, saying "I have written three thesis" instead of "I have written three theses" can distract your reader from your main argument. This kind of mistake can diminish the clarity of your writing and affect how your ideas are perceived.

Strategies to Avoid Common Mistakes

To avoid these errors, consider the following strategies:

• Familiarize yourself with the definitions of both terms.
• Proofread your work to catch any misuses before submission.
• Seek feedback from peers or mentors who can help identify errors.
• Use writing tools that can flag incorrect usage.

By implementing these strategies, you can enhance the clarity of your writing and ensure that your academic work is taken seriously. Remember, clarity is key in academic discourse, and using the correct terminology is a fundamental part of that clarity.

The Importance of Clarity in Thesis Statements

Characteristics of a clear thesis statement.

A clear thesis statement is essential for effective academic writing. It serves as a guiding light , helping both you and your readers understand the main argument of your paper. Here are some key characteristics:

• Specificity : Your thesis should focus on a particular aspect of your topic.
• Debatable : It should present an argument that others might challenge.
• Clarity : Use straightforward language to express your ideas clearly.

The Role of Clarity in Academic Success

Clarity in your thesis statement can significantly impact your academic success. A well-defined thesis helps you stay organized and focused, ensuring that your paper remains coherent. When your readers grasp your main point easily, they are more likely to engage with your work.

Examples of Clear vs. Vague Thesis Statements

To illustrate the difference, consider the following examples:

By comparing these examples, you can see how clarity enhances the effectiveness of your argument.

In summary, a clear thesis statement is not just a requirement; it is a vital component of your academic writing that can lead to greater understanding and success. For more resources on crafting effective thesis statements, consider checking out the [ thesis success essentials ](https://www.researchrebels.com/products/thesis-success-essentials-free-25-templates) offered by Research Rebels, which provide templates and guidance to help you succeed in your thesis journey.

Additionally, remember that a strong thesis statement helps clarify the main argument or point of your paper, providing a clear direction for both you as the writer and your readers. This clarity is crucial for effective communication in academic writing.

Thesis vs Theses in Different Academic Disciplines

Variations in usage across fields.

In various academic fields, the terms thesis and theses can have different meanings and implications. For instance, in the humanities, a thesis often represents a comprehensive argument or analysis, while in the sciences, it may focus more on empirical research. Understanding these distinctions is crucial for your academic success.

Disciplinary Expectations for Thesis Statements

Each discipline has its own expectations regarding thesis statements. Here are some general guidelines:

• Humanities : Emphasize argumentation and critical analysis.
• Sciences : Focus on hypothesis testing and empirical data.
• Social Sciences : Combine both qualitative and quantitative approaches.

Case Studies of Theses in Various Disciplines

To illustrate the differences, consider the following examples:

By recognizing these variations, you can tailor your thesis to meet the specific expectations of your field, enhancing your academic writing and research outcomes. This understanding can significantly impact your clarity and effectiveness in presenting your ideas.

The Evolution of Thesis in Academic Discourse

Historical context of thesis development.

The concept of a thesis has evolved significantly over time. Initially, a thesis was merely a statement of belief or opinion. Today, it represents a comprehensive argument supported by research. This shift reflects the growing complexity of academic inquiry and the need for rigorous evidence.

Changes in Thesis Requirements Over Time

As academic standards have changed, so have the requirements for theses. In the past, a simple assertion might have sufficed. Now, you are expected to engage deeply with your topic, presenting a well-structured argument. This evolution is evident in various disciplines, where the expectations for depth and clarity have increased.

Future Trends in Thesis Writing

Looking ahead, the landscape of thesis writing is likely to continue evolving. With the rise of technology and interdisciplinary studies, you may find that your thesis needs to incorporate diverse methodologies and perspectives. For instance, trending topics for 2024 include AI and sustainability, which require a nuanced approach to research and argumentation.

In summary, understanding the evolution of the thesis is crucial for your academic success. By recognizing how the expectations have changed, you can better prepare yourself to meet the demands of your field. This insightful perspective enables the examination of the complex interplay between language choices and the broader social character of disciplines, as noted in the work of J. Flowerdew.

Practical Tips for Crafting a Strong Thesis

Steps to develop a thesis statement.

• Identify the core argument of your essay. What is the main point you want to make?
• Make a claim or argument in one sentence. This will be your thesis statement.
• Ensure that your thesis is specific enough to be manageable but broad enough to allow for comprehensive discussion.

Common Pitfalls to Avoid

When crafting your thesis, be mindful of these common mistakes:

• Writing a thesis that is too general or lacks a clear argument.
• Failing to take a definitive stance or presenting a mere fact as a thesis.
• Ignoring the importance of revising and refining the thesis as your research evolves.

Resources for Thesis Development

To help you along the way, consider utilizing resources like the interview research roadmap , which provides essential guidance for mastering interview techniques crucial for thesis research. It offers step-by-step instructions on conducting, analyzing, and reporting interviews, helping to alleviate anxiety and uncertainty. Additionally, check out guides on discovering statistics using SPSS , which can enhance your research skills and provide insights into related academic topics.

Remember, a strong thesis statement is essential for setting the direction and focus of your research paper.

The Relationship Between Thesis and Research Questions

How thesis statements emerge from research questions.

Your thesis statement is like a roadmap for your research. It emerges from your research questions , which help you focus on what you want to explore. A well-defined research question leads to a strong thesis statement. For example, if your research question is about the effects of social media on mental health, your thesis might argue that social media has a significant negative impact on mental well-being.

The Interplay of Thesis and Research Objectives

The relationship between your thesis and research objectives is crucial. Your thesis should reflect the goals of your research. Here’s how you can align them:

• Identify your main research question.
• Define your objectives clearly.
• Ensure your thesis statement addresses these objectives.

This alignment helps maintain clarity and focus throughout your research process.

Examples of Thesis and Research Question Alignment

To illustrate this relationship, consider the following examples:

These examples show how a clear research question can lead to a focused and impactful thesis statement. By understanding this relationship, you can enhance the quality of your academic writing and research.

Thesis Defense: The Role of Theses in Academic Evaluation

Understanding the thesis defense process.

The thesis defense, often called the viva, is a critical part of your academic journey. During this process, you present your research to a panel of experts who will evaluate your work. This is your moment to shine! You will need to clearly explain your research question, methodology, and findings. The panel will ask questions to test your understanding and ability to defend your thesis.

Evaluating Theses: Criteria and Standards

When evaluating a thesis, the committee looks for several key elements:

• Clarity of the thesis statement : Is it specific and arguable?
• Depth of research : Have you thoroughly explored your topic?
• Methodological rigor : Are your methods sound and appropriate?
• Contribution to the field : Does your work add new knowledge or insights?

These criteria help ensure that your thesis meets academic standards and contributes meaningfully to your field.

The Importance of Theses in Academic Progression

Completing a thesis is not just about earning a degree; it also marks a significant milestone in your academic career. A well-defended thesis can open doors to further research opportunities, academic positions, and professional roles. It demonstrates your ability to conduct independent research and articulate complex ideas clearly. Resources like the Thesis Dialogue Blueprint can help you prepare effectively, ensuring you feel confident during your defense. Additionally, programs like the Thesis Action Plan provide structured support to help you navigate this challenging process.

In summary, the thesis defense is a vital step in your academic journey, showcasing your hard work and dedication. By understanding the evaluation criteria and preparing thoroughly, you can make a strong impression on your committee and advance your academic career.

Navigating the Thesis Writing Process

Writing a thesis can feel overwhelming, but breaking it down into manageable steps can make the process smoother. Understanding the stages of thesis writing is crucial for success. Here’s how you can navigate this journey effectively:

Stages of Thesis Writing

• Planning : Start by outlining your thesis. This will serve as your roadmap.
• Research : Gather relevant information and data to support your arguments.
• Drafting : Write your first draft without worrying about perfection. Just get your ideas down.
• Revising : Review your draft, focusing on clarity and coherence. Make necessary changes.
• Editing : Check for grammar, punctuation, and formatting errors.
• Finalizing : Prepare your thesis for submission, ensuring it meets all requirements.

Time Management Strategies for Thesis Completion

Managing your time effectively is key to avoiding stress. Here are some strategies:

• Set specific goals for each writing session.
• Break your work into smaller tasks to make it less daunting.
• Use tools like calendars or apps to keep track of deadlines.

Utilizing Feedback in Thesis Development

Feedback is essential for improving your thesis. Here’s how to make the most of it:

• Share your drafts with peers or advisors for constructive criticism.
• Be open to suggestions and willing to make changes.
• Use feedback to refine your arguments and enhance clarity.

By following these steps, you can navigate the thesis writing process with confidence. Remember, resources like the Thesis Action Plan can provide structured guidance to help you stay on track and reduce anxiety. Additionally, learning how to write dissertation fast can significantly enhance your efficiency and productivity.

Writing a thesis can feel like a huge mountain to climb, but you don’t have to do it alone! If you’re feeling stressed or unsure about where to start, check out our website for helpful guides and tips . We’re here to make the process easier for you. Don’t wait—visit us now and take the first step toward a successful thesis!

In summary, understanding the difference between "thesis" and "theses" is essential for anyone involved in academic writing. A thesis refers to a single statement or argument, while theses is the plural form, indicating multiple statements or arguments. This distinction is not just a matter of grammar; it reflects the depth and breadth of academic inquiry. By grasping these terms, students can enhance their writing and communication skills, ensuring clarity in their work. Therefore, taking the time to learn and apply these concepts will greatly benefit your academic journey.

Frequently Asked Questions

What is the difference between a thesis and theses.

A thesis is a single statement that presents the main idea of a paper. Theses is the plural form, meaning more than one thesis.

Why is a thesis statement important?

A thesis statement is important because it gives direction to your paper, helping readers understand what to expect.

When should I use the word 'theses'?

You should use 'theses' when talking about multiple thesis statements or research papers.

What are common mistakes in writing a thesis statement?

Common mistakes include being too vague, making it too broad, or simply stating a fact without offering an argument.

How can I improve my thesis statement?

To improve your thesis statement, make it specific, debatable, and ensure it reflects the main argument of your paper.

What role does a thesis play in research?

A thesis acts as a guide for your research, helping you stay focused on your main argument throughout your work.

Can a thesis statement change during the writing process?

Yes, a thesis statement can change as you develop your ideas and gather more information during your research.

How do I know if my thesis statement is strong?

A strong thesis statement is clear, specific, and takes a stance that can be supported with evidence throughout your paper.

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Grammarflex

What’s the Plural of Thesis? (Thesises? Theses?)

• November 13, 2022

What’s the plural of “thesis”?

Thesis , (and its plural theses ) is an example of one of the many common English words that has roots elsewhere. In this case, thesis is a word that has roots all the way back to Ancient Greek. Like other similarly structured words: diagnosis , synthesis , analysis , oasis , crisis , nemesis and the like, thesis is by no means the only frequently used Greek word that’s made it to Modern English.

What’s the singular of thesis?

Thesis is a singular noun and refers to one thing (or one thesis ).

What’s a thesis?

Merriam-Webster defines the noun thesis (plural theses ) as follows, “a dissertation embodying results of original research and especially substantiating a specific view especially : one written by a candidate for an academic degree.”

Nouns that end in -sis/ses

Thesis is an irregular plural noun that does not end in the typical -s / -es that regular plural noun forms take. This is so despite that theses plural does in fact end in the conventional -s/-es suffix. Why is it still considered irregular; then, given that it follows the regular plural form? Notice the following regular plural noun forms:

Thesis / theses operates differently. With these Greek words, the -ses does not simply  add onto the end of the singular form of the noun; instead, -ses replaces the singular noun’s suffixes, and effectively changes the entire spelling of the word (and arguably the word itself.)

Examples of “thesis” (singular) in sentences

His master thesis was on modal neural networks.

She wrote her thesis on Renaissance Nativity scenes.

We disagreed with the basic thesis of the report.

I’ve made a first draft of my thesis .

The student’s experiments helped her formulate a thesis to share with her professor and classmates.

Examples of “theses” (plural) in sentences

It must not be assumed that Luther’s ninety-five theses produced any considerable direct results.

The collection of theses are ready for publication.

Twenty years after Savonarola’s death Martin Luther made public his theses against indulgences.

Theses are generally examined by two or more specialists.

Theses is the plural form of the singular noun thesis.

Origin of the word “thesis”

Thesis / theses are of Greek origin.

Read about other irregular nouns

• What’s the plural of bison?
• What’s the plural of moose?
• What’s the plural of sheep?
• What’s the plural of ox?
• What’s the plural of cactus?
• What’s the plural of crisis?
• What’s the plural of hypothesis?

Read about other topics in grammar

• What’re personal pronouns?
• What’s the difference between they’re, their, and there?
• Whose vs who’s?
• Merriam-Webster, thesis/theses.

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Meaning of theses in English

Examples of theses.

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a person who knows a lot about a particular subject and is therefore often asked to give an opinion about it

Cooking or hitting the books? (Idioms with ‘book’)

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English Teacher Site

Whats the Plural of Thesis: Understanding Singular and Plural Forms

• The plural of “thesis” adheres to the Greek-rooted pattern, changing the singular -is to a plural -es.
• Accurate use of “thesis” and “theses” reflects scholarly precision in both written and oral communication.
• Awareness of correct pluralization extends to other similar nouns ending in -sis, emphasizing the importance of understanding language origins.

It is crucial to use the word correctly in both singular and plural contexts to maintain the integrity of written and spoken communication. In the realm of academics, precision in language reflects the rigor of one’s research and argumentation. As such, understanding the transformation from “thesis” to its plural counterpart is more than a trivial detail; it reflects a deeper appreciation for the structure and history of the English language.

Table of Contents

What’s the Plural of Thesis?

The proper plural of thesis is “theses.” This transformation is part of a broader pattern in the English language where certain nouns change their ending to reflect a plural state.

Below, a comparison is made to illustrate the standard singular to plural transformation for nouns ending in -is:

Key Points about the pluralization of “thesis”:

• The plural follows a specific rule of changing the ‘-is’ ending to ‘-es’.
• This pattern is consistent with other Greek-derived words.
• The pronunciation changes with the plural form, ending in “-eez.”

To clarify usage, consider these examples:

• Singular: The student’s thesis was commended for its clarity.
• Plural: The professor read all the submitted theses before the conference.

Singular Form of Thesis

The singular form of ‘thesis’ is of notable interest due to its origins and distinct pluralization.

Origination and Definition:

• Etymology : Derived from the ancient Greek word τίθημι (tithēmi), which means “to put” or “to place.”
• Meaning : It is a statement or theory put forward to be maintained or proved.

Usage in Academia:

• A significant piece of writing prepared by a student to obtain a university degree or diploma.
• Often involves original research and substantiates a particular view or argument.

Table 1: Notable Features of ‘Thesis’

Table 2: Contextual Examples

Definition of Thesis

A thesis is a substantial piece of scholarly writing that is typically required to obtain a master’s or doctoral degree. It represents the author’s research and findings in their chosen field of study. A thesis serves as evidence that the student has acquired the knowledge necessary to be considered a scholar in the field. Here, two key aspects of a thesis will be described through tables:

Purpose and Composition of a Thesis:

Characteristics of a Thesis:

• Focused : It should have a clear, concise premise or central argument.
• Researched : Employs rigorous methodologies to gather and analyze data.
• Structured : Contains defined sections that present information logically.
• Cited : Includes proper citations of sources that support or contrast the thesis.
• Reviewed : Undergoes scrutiny by academic peers or supervisors.

Other Irregular Plural Nouns Ending in -sis/ses

Below you will find two tables categorized by common and less common irregular plurals that follow this pattern.

Common Irregular Plurals:

This pattern is often observed with words that have Greek origins.

Less Common Irregular Plurals:

It is important to recognize these forms to maintain grammatical accuracy in writing and speech. Below is a list of examples used in sentences:

• When multiple scientific hypotheses are tested, the results can lead to important discoveries.
• During the editing process, Jane had to review all the parentheses to ensure clarity in her writing.
• Geographers study multiple oases in the desert to understand these unique ecosystems.
• His thesis on renewable energy was well-received, and many theses on the subject reference his work.

Examples of Thesis (Singular) in Sentences

Here are examples that demonstrate its usage in various sentences.

In Academic Context

In everyday discourse.

Informal setting : During the debate, his thesis was that space exploration is no longer just a dream but a necessity.

• Discussing beliefs : Her thesis is that all public spaces should offer free Wi-Fi.
• Opinion : They argued the thesis that high taxes discourage spending.

Examples of Theses (Plural) in Sentences

Here are some examples of how “theses” can be used in sentences:

Education Setting : Graduate students often struggle to find unique topics for their theses as most ideas have been extensively explored.

• Evaluating the structure and arguments of different theses can help one build a stronger dissertation.

Origin of the Word Thesis

The term thesis originates from the ancient Greek word θέσις (thésis), which means “a proposition” . Historically, this term has played a crucial role in both rhetorical and academic contexts. It denotes a statement that a writer intends to support and prove. In academic circles, thesis often refers to a document that presents the author’s research and findings and is submitted in support of candidature for a degree or professional qualification.

Etymological Background

The journey of the word from its Greek roots to the modern English language reflects the changing dynamics of educational and scholarly practices over the centuries.

As a carryover from Greek to Latin, the word made its way into English, maintaining its original Greek plural form:

Usage in Academia

In academia, the word has been used since the late Middle Ages to denote a scholarly work written by students aiming to obtain a university degree. Over time, the use of thesis expanded from merely referring to a proposition to a lengthy document providing evidence of comprehensive research.

Historical Evolution:

• Middle Ages : Referred to propositions for a degree.
• Renaissance : Emphasized individual research.
• Modern Usage : Extensive research documents for higher education degrees.

Areas of Impact:

• Rhetoric : Considered as a premise to be argued.
• Academic Research : Reflects comprehensive study in a field.

My name is Khamis Maiouf. I am the creator of the English Teacher Site, dedicated to providing valuable resources and insights for students around the world. With a passion for education and a commitment to helping students enhance their skills, I aim to make English teaching more effective and enjoyable for both educators and students.

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The Plural of Thesis: Getting it Right

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The plural of thesis is theses (pronounced THEE-seez).

You use theses when referring to more than one thesis paper or document.

Why is There Confusion Over The Plural of Thesis?

It is a mistake to write the plural of thesis as thesises or thesisi. These are not correct. People make this mistake because they are not used to irregular pluralization.

Is Thesis a Countable or Uncountable Noun?

Thesis can refer to either a research paper (which you can count) or an idea in that paper (which you can’t count). This makes thesis either countable or uncountable depending on context. But the rule’s pretty clear.

When is Thesis Countable?

“Thesis” means a long research paper turned in for a degree. Here, thesis refers to one single paper, so you can use it to talk about multiple projects.

“Thesis” also means the main idea in a long paper. You can’t count ideas, so here thesis is singular.

Where did Thesis Come From?

The word thesis comes from the Greek word θέσις (thesis) meaning “a proposition” or “position.”

In Latin and Greek long ago, thesis meant an argument or proposal. Folks used it for written work or the concept inside it.

The irregular pluralization of thesis comes from its Greek roots.

When Do You Use Theses?

Since a thesis can mean a research paper, it can be plural. When mentioning more than one paper, dissertation or project, use theses.

For example:

• The library collected remarkable theses from last semester.
• The students bound their theses with plastic covers.

When is Thesis Singular?

When thesis refers to just the concept, theory, or proposition in a paper, it’s a single abstract idea. Keep it singular here even with multiple papers.

For instance:

• Her thesis brought insightful ideas to the topic.
• Each thesis offered unique evidence.

Other irregular plurals:

• Plural of oasis
• Plural of calf

The Bottom Line: The plural of thesis

To sum up, theses is the plural form of thesis when referring to multiple discrete written works. However, thesis itself remains uncountable when used as an umbrella term for an abstract idea. Use theses when mentioning multiple research papers or dissertations. Stick with thesis when discussing the main idea — even for many projects.

Check if thesis refers to:

• One or more physical paper(s) ( theses )
• A concept inside one or more paper(s) ( thesis )

This basic test makes plurals a piece of cake!

Quick Reference Guide

• Noun referring to a dissertation, treatise or other written work submitted in completion of a degree.
• Countable when referring to multiple discrete works.
• Plural form of thesis, used when quantifying multiple treatises or dissertations

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