Theory

Definition

Theory is a noun that refers to a system of ideas intended to explain a phenomenon, often based on general principles independent of the thing to be explained. It can also mean a set of principles on which the practice of an activity is based.

Parts of Speech

• Noun

Pronunciation

American English

• IPA Pronunciation: /ˈθɪr.i/ or /ˈθiː.ə.ri/
• Respelling: THEER-ee or THEE-uh-ree

British English

• IPA Pronunciation: /ˈθɪə.ri/ or /ˈθiː.ə.ri/
• Respelling: THEER-ee or THEE-uh-ree

Etymology

The word "theory" originates from the Greek "theōría," meaning "a contemplation or speculation," derived from "theōrein" (to look at, consider). It was later adopted into Late Latin as "theoria," and Middle English borrowed the term to mean "speculation or contemplation."

Derivatives

• Theoretical (adjective)
• Theorist (noun)
• Theoretically (adverb)
• Theorize (verb)
• Theorization (noun)

Synonyms

• Hypothesis
• Concept
• Model

Antonyms

• Fact
• Reality
• Certainty

Usage

The noun "theory" is often used in scientific, philosophical, and academic contexts. For example, "Einstein's theory of relativity revolutionized physics." It is also used in general language to describe a speculative explanation, as in "I have a theory about why she left early."

Related Terms

• Law: A statement based on repeated experimental observations describing some aspect of the world.
• Principle: A fundamental truth or proposition serving as the foundation for a system of belief or behavior.
• Postulate: A thing suggested or assumed as true as the basis for reasoning or discussion.

Detailed Definitions

Noun

• A system of ideas explaining a phenomenon: Refers to a structured explanation supported by evidence and reasoning.
  • Example: "Darwin's theory of evolution is widely accepted."
• An idea or set of principles forming the basis of an activity: Describes the underlying concepts that guide a practice or discipline.
  • Example: "His cooking theory emphasizes the balance of flavors."
• Speculation or conjecture: Refers to an unproven idea used as a basis for discussion.
  • Example: "She has a theory about the missing keys."