Plural Form of Thesis – A Complete Guide by Anushram
The English language often confuses learners when it comes to irregular plural forms, and one classic example is the plural form of thesis. While most nouns form their plural simply by adding “-s” or “-es,” certain words derived from Latin or Greek follow different rules. The word thesis is one such term. Understanding the plural form of thesis is important for students, researchers, writers, and academic professionals.
At Anushram, we specialize in academic writing support, research guidance, and thesis services, so we frequently deal with multiple theses. In this comprehensive guide, we will explore the meaning, correct pluralization, grammar rules, usage examples, and common mistakes related to the plural form of thesis.
What is a Thesis?
Before we explore the plural form of thesis, let’s understand what a thesis actually means. A thesis is an academic document presenting an author’s research and findings, typically submitted for higher education degrees such as a Master’s or Ph.D. It serves as evidence of a student’s research capabilities, analytical thinking, and subject expertise.
A thesis is more than just a paper; it’s a structured argument supported by evidence. When there is more than one thesis, we use its plural form, which is theses.

Plural Form of Thesis – The Correct Answer
The plural form of thesis is theses.
- Singular: Thesis
- Plural: Theses
This irregular plural form comes from Greek, where “-is” endings change to “-es” in the plural. The same rule applies to other words like crisis → crises and analysis → analyses.
Why is it Theses and Not Thesises?
In English, some words do not follow the regular pluralization rules. Since thesis has its roots in Greek, its plural form of thesis changes “-is” to “-es” rather than adding “-s.”
Example:
- Incorrect: I have written three thesises.
- Correct: I have written three theses.
At Anushram, we always ensure that your academic content follows correct grammar rules, including the proper use of the plural form of thesis.
Examples of the Plural Form of Thesis in Sentences
To better understand the plural form of thesis, let’s see how it is used in real-world contexts:
- The professor reviewed all the theses submitted by the graduate students.
- At Anushram, we help students write and format their theses professionally.
- The conference featured presentations of several outstanding theses.
- Different theses presented diverse viewpoints on the same topic.
- The library’s archive contains over 500 academic theses.
Grammatical Rules Related to the Plural Form of Thesis
- Irregular Pluralization Rule – For Greek-origin nouns ending in “-is,” replace “-is” with “-es” for plural.
- Subject-Verb Agreement – The plural form of thesis requires a plural verb. Example: These theses are well-written.
- Consistency in Academic Writing – In research papers, always use theses when referring to more than one thesis.
Common Mistakes to Avoid
When using the plural form of thesis, many learners make errors. The most frequent include:
- Adding an extra “-s” (e.g., thesises)
- Mixing singular and plural forms in the same sentence
- Forgetting subject-verb agreement
Example of Incorrect Usage:
The theses is available in the library.
Correct Usage:
The theses are available in the library.
Plural Form of Thesis in Academic Context
In academia, it’s common to encounter multiple theses—whether you are a student writing them or a professor evaluating them. Understanding the correct plural form of thesis is vital because it reflects your grasp of academic English and your attention to detail.
At Anushram, we often guide students not only in writing a single thesis but in comparing and analyzing multiple theses for literature reviews, comparative studies, and meta-analyses.
How to Remember the Plural Form of Thesis
Here are some quick tips:
- Memory Trick: Remember that “thesis” works like “crisis” → crises, so “thesis” → “theses.”
- Practice Sentences: Write a few sentences daily using the plural form.
- Visual Cues: Think of a stack of research documents – multiple theses.
Plural Form of Thesis vs. Other Similar Words
Singular | Plural | Origin |
---|---|---|
Thesis | Theses | Greek |
Crisis | Crises | Greek |
Analysis | Analyses | Greek |
Synopsis | Synopses | Greek |
The Role of Anushram in Thesis and Theses Writing
Whether you are preparing one thesis or several theses, Anushram offers professional guidance in:
- Topic selection
- Research methodology
- Literature review writing
- Data analysis
- Formatting and proofreading
Our expertise ensures that your theses meet university standards and are ready for submission.
Frequently Asked Questions (FAQ) on the Plural Form of Thesis
Q1. What is the plural form of thesis?
The plural form of thesis is theses.
Q2. Can we say “thesises”?
No, the correct form is theses, not thesises.
Q3. Why does thesis change to theses?
Because it is derived from Greek, where “-is” changes to “-es” in plural.
Q4. How do you pronounce the plural form of thesis?
It is pronounced as thee-seez.
Q5. Does Anushram help with writing theses?
Yes, Anushram provides complete thesis and theses writing services.
Conclusion
The plural form of thesis is theses, a rule inherited from Greek grammar. Using the correct plural form is essential for clear and professional academic communication. At Anushram, we help students, researchers, and professionals create high-quality theses that meet international academic standards.
By mastering the plural form of thesis, you not only improve your grammar but also enhance your credibility in scholarly writing.
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