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Plural of Hypothesis: The Correct Form for American English

plural of hypothesis

As a professional copywriting journalist, I often come across language nuances that can be tricky to navigate. One such nuance is the correct plural of “hypothesis” in American English. Understanding and using the correct plural form is crucial for effective communication. Let’s explore this topic further.

The Singular and Plural of Hypothesis

  • Singular: Hypothesis
  • Plural: Hypotheses

The plural form of “hypothesis” is “hypotheses.” This transformation follows a common pattern in English where nouns of Greek origin ending in “-is” change to “-es” in the plural.

Understanding Hypothesis

Definition of Hypothesis

A hypothesis is a tentative assumption or proposition made to draw out and test its logical or empirical consequences. In the scientific method, it's an initial concept formulated to explain phenomena that are not yet comprehensively understood.

Usage of Hypothesis

In usage, “hypothesis” often implies a level of uncertainty and is used to express an idea that has not yet been proven but is under investigation. In scientific research, hypotheses are subject to rigorous testing and validation.

Use of Hypothesis in Sentences

  1. Singular: “Her hypothesis about the correlation between sleep patterns and productivity was intriguing.”
  2. Plural: “The researchers tested several hypotheses to determine the most effective treatment method.”
  3. Singular: “A good hypothesis should be testable and falsifiable.”
  4. Plural: “Among the various hypotheses, the one related to environmental factors seemed most plausible.
  5. Singular: “His hypothesis was later proven to be accurate, changing our understanding of the phenomenon.

Common Mistakes and Confusions

  • Incorrect Plural: Hypothesises, Hypothesi, Hypothesees.
  • Misinterpretation: Confusing a hypothesis (a proposed explanation) with a theory (a well-substantiated explanation).
  • Usage in Non-Scientific Context: Sometimes used incorrectly to mean a guess or a hunch, which lacks the structured reasoning of a hypothesis.

Commonly Asked Questions

  • Q: Can “hypotheses” be used for a single hypothesis?
    A: No, “hypotheses” is strictly plural and should only be used when referring to more than one hypothesis.
  • Q: Is the word “hypothesis” used outside scientific contexts?
    A: Yes, it can be used in everyday language to describe an assumption or idea that is yet to be tested or proven.


Understanding the correct usage of “hypothesis” and its plural form “hypotheses” is essential for clear and accurate communication, especially in scientific and academic settings. Remembering this distinction helps maintain the precision so crucial in these domains, thereby facilitating effective discourse and knowledge exchange.

definition of hypothesis
correct plural form


What is the plural of “hypothesis”?

The plural of “hypothesis” is “hypotheses.”

How are hypotheses used in scientific research?

Hypotheses are used as provisional explanations for phenomena in scientific research and guide investigations.

What is the importance of using the correct plural form for “hypothesis”?

Using the correct plural form, “hypotheses,” adheres to the Greek root of the word and ensures clarity and accuracy in communication.

Are there any alternative plural forms for “hypothesis”?

No, there are no alternative plural forms for “hypothesis” in American English.

Are there any spelling and grammar rules for forming plurals that apply to “hypothesis”?

The plural form “hypotheses” follows the rule for nouns ending in “is” by changing the “is” to “es,” reflecting its Greek origin.

How do hypotheses differ from theories and laws?

A hypothesis is a provisional explanation, while theories and laws are more established and comprehensive explanations of phenomena.

Jessica Smith

Jessica Smith

Jessica Smith, writer at, blends creativity with insight, exploring technology, culture, and psychology. With a background in English Literature, she crafts engaging stories inspired by nature and urban life. Outside writing, she enjoys exploring and continuous learning.View Author posts

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