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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

the·o·ry

Audio Help [thee-uh-ree, theer-ee] Pronunciation Key

–noun, plural -ries.

1.	a coherent group of general propositions used as principles of explanation for a class of phenomena: Einstein's theory of relativity.

2.	a proposed explanation whose status is still conjectural, in contrast to well-established propositions that are regarded as reporting matters of actual fact.

3.	Mathematics. a body of principles, theorems, or the like, belonging to one subject: number theory.

4.	the branch of a science or art that deals with its principles or methods, as distinguished from its practice: music theory.

5.	a particular conception or view of something to be done or of the method of doing it; a system of rules or principles.

6.	contemplation or speculation.

7.	guess or conjecture.

[Origin: 1590–1600; < LL theōria < Gk theōría a viewing, contemplating, equiv. to theōr(eǐn) to view + -ia -y³

]

—Synonyms 1. Theory, hypothesis are used in non-technical contexts to mean an untested idea or opinion. A theory in technical use is a more or less verified or established explanation accounting for known facts or phenomena: the theory of relativity. A hypothesis is a conjecture put forth as a possible explanation of phenomena or relations, which serves as a basis of argument or experimentation to reach the truth: This idea is only a hypothesis.

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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Encyclopædia Britannica, Inc.
Theories

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American Heritage Dictionary - Cite This Source - Share This

the·o·ry Audio Help (thē'ə-rē, thîr'ē) Pronunciation Key
n. pl. the·o·ries

A set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena.
The branch of a science or art consisting of its explanatory statements, accepted principles, and methods of analysis, as opposed to practice: a fine musician who had never studied theory.
A set of theorems that constitute a systematic view of a branch of mathematics.
Abstract reasoning; speculation: a decision based on experience rather than theory.
A belief or principle that guides action or assists comprehension or judgment: staked out the house on the theory that criminals usually return to the scene of the crime.
An assumption based on limited information or knowledge; a conjecture.

[Late Latin theōria, from Greek theōriā, from theōros, spectator : probably theā, a viewing + -oros, seeing (from horān, to see).]

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The American Heritage Science Dictionary - Cite This Source - Share This

theory Audio Help (thē'ə-rē, thîr'ē) Pronunciation Key
A set of statements or principles devised to explain a group of facts or phenomena. Most theories that are accepted by scientists have been repeatedly tested by experiments and can be used to make predictions about natural phenomena. See Note at hypothesis.

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