Hypothesis: Definition, Meaning, and Examples

Last Updated on
December 6, 2025

1. Hypothesis (noun): A proposed explanation for a phenomenon, based on limited evidence, to be tested scientifically.
2. Hypothesis (noun): A tentative assumption or educated guess made for the sake of argument or investigation.
3. Hypothesis (noun): A logical supposition or theory that serves as a starting point for further research.

The word "hypothesis" refers to a proposed explanation for something that can be tested or explored through study and observation. It is commonly used in scientific research to suggest a possible answer or pattern before experiments are conducted. In casual settings, people may use it to describe a guess or assumption they want to explore. Learn more about how this term shapes thinking in science, philosophy, and everyday problem-solving.

Hypothesis Definition: What Does "Hypothesis" Mean?

A "hypothesis" is an educated guess or assumption made to explain a phenomenon, which is then tested through research and experimentation.

Definition of "Hypothesis": Scientific Explanation

In scientific research, a "hypothesis" is a testable statement that predicts an outcome based on existing knowledge.

Definition of "Hypothesis": Logical Assumption

It can also refer to a logical assumption that is used as a starting point for further investigation.

Parts of Speech

The word "hypothesis" is a noun. It refers to a proposed explanation or assumption that can be tested through scientific research or logical reasoning. As a singular noun, it is used to describe a single assumption or supposition, while its plural form, "hypotheses," is used when referring to multiple propositions. Although rarely used as a verb, the related term "hypothesize" serves this function, meaning to form or propose a hypothesis. The adjective form, "hypothetical," describes something that is based on a hypothesis rather than concrete evidence.

How to Pronounce "Hypothesis"?

The word "hypothesis" is pronounced as "hy-POTH-uh-sis." It has four syllables, with the emphasis placed on the second syllable. The first part, "hy," sounds like the word "high." The second syllable, "poth," rhymes with "moth." The third part, "uh," is a soft, unstressed sound. The final syllable, "sis," sounds like "sis" in "sister." When saying "hypothesis," make sure to stress the "POTH" syllable clearly while keeping the other syllables naturally pronounced.

Phonetic Pronunciation: /haɪˈpɒθ.ə.sɪs/

Synonyms of "Hypothesis": Other Ways to Say "Hypothesis"

Several words convey similar meanings to "hypothesis."

  • Theory
  • Assumption
  • Proposition
  • Premise
  • Speculation
  • Postulate
  • Supposition

Antonyms of "Hypothesis": Other Ways to Say "Hypothesis"

There are some words that convey the opposite meaning of "hypothesis."

  • Fact
  • Truth
  • Reality
  • Certainty
  • Conclusion

Examples of "Hypothesis" in a Sentence

Here are ten examples of "hypothesis" used in different contexts.

  1. The scientist proposed a hypothesis about the effects of climate change on polar bear populations.
  2. Her hypothesis suggested that students learn better in natural environments.
  3. The team conducted an experiment to test their hypothesis about bacteria growth.
  4. Without data, his hypothesis remained purely theoretical.
  5. The professor explained that a strong hypothesis should be testable and falsifiable.
  6. She developed a hypothesis that social media usage affects sleep patterns.
  7. Their research confirmed the initial hypothesis regarding water contamination.
  8. The detective’s hypothesis was based on circumstantial evidence.
  9. The new findings contradicted the widely accepted hypothesis.
  10. After extensive research, they revised their hypothesis to align with new discoveries.

Frequency of Use

The word "hypothesis" is common in academic and scientific writing, especially in fields such as psychology, biology, and economics. Based on data from Google's Ngram Viewer, its use grew significantly during the 20th century as scientific research became more formalized. It remains widely used in textbooks, journals, and lectures.

Variants of "Hypothesis"

A different form of "hypothesis" is:

  1. Hypothetical: An adjective referring to something based on a "hypothesis."

Related Terms to "Hypothesis"

Several words are closely related to "hypothesis."

  1. Scientific method
  2. Experiment
  3. Theory
  4. Prediction
  5. Analysis
  6. Conclusion

Etymology: History and Origins of "Hypothesis"

"Hypothesis" comes from the Greek word "hypothesis," which means “base” or “foundation,” and was used by philosophers like Plato. It entered Latin as "hypothesis" before moving into Middle French and then English around the late 1500s. In early English usage, it often referred to a philosophical assumption rather than a testable theory. By the 1600s, it began taking on the scientific meaning we use today, especially during the rise of empirical research.

Derivatives and Compounds of "Hypothesis"

Words derived from "hypothesis" include:

  1. Hypothetical: Based on a "hypothesis."
  2. Hypothesize: The verb form, meaning to propose a "hypothesis."

Common Misspellings of "Hypothesis"

People often misspell "hypothesis" as:

  1. Hypothasis
  2. Hipothesis
  3. Hypothesus

10 Idioms Similar to "Hypothesis"

Here are idioms related to the idea of assumptions and theories:

  1. Rule of thumb
  2. Educated guess
  3. Ballpark figure
  4. Make an assumption
  5. Work in theory
  6. Put two and two together
  7. Jump to conclusions
  8. Think outside the box
  9. On a hunch
  10. Draw an inference

10 Common Questions About "Hypothesis"

Here are common questions about "hypothesis" and their answers.

1. What is a "hypothesis"?

A "hypothesis" is a proposed explanation for an observation or phenomenon that can be tested through research and experimentation.

2. How is a "hypothesis" different from a theory?

A "hypothesis" is a testable assumption, whereas a theory is a well-substantiated explanation supported by evidence.

3. What are the characteristics of a good "hypothesis"?

A good "hypothesis" should be testable, specific, measurable, and falsifiable.

4. Can a "hypothesis" be proven true?

No, a "hypothesis" can be supported by evidence but never proven with absolute certainty, as future research may provide new insights.

5. What are the different types of "hypotheses"?

There are several types, including null "hypothesis," alternative "hypothesis," directional "hypothesis," and non-directional "hypothesis."

6. How do you formulate a "hypothesis"?

To formulate a "hypothesis," identify a research question, conduct background research, and propose a testable statement.

7. What is the difference between a null "hypothesis" and an alternative "hypothesis"?

A null "hypothesis" states that there is no effect or relationship, while an alternative "hypothesis" suggests that there is an effect or relationship.

8. Why is a "hypothesis" important in scientific research?

A "hypothesis" guides the research process by providing a clear direction for experimentation and analysis.

9. Can a "hypothesis" be revised?

Yes, a "hypothesis" can be modified or refined based on new data and research findings.

10. What is an example of a simple "hypothesis"?

"If plants receive more sunlight, then they will grow taller." This is a basic cause-and-effect "hypothesis."

Conclusion

The word "hypothesis" is a testable assumption or proposed explanation used in scientific research to understand and predict phenomena. It plays a crucial role in forming the foundation of experiments and logical reasoning. Understanding and using a "hypothesis" correctly enhances critical thinking and problem-solving skills, making it a fundamental concept in both academic and everyday contexts.

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