Meaning of THEORY in English

transcription, транскрипция: [ ˈthē-ə-rē, ˈthir-ē ]


( plural -ries )

Etymology: Late Latin theoria, from Greek theōria, from theōrein

Date: 1592

1. : the analysis of a set of facts in their relation to one another

2. : abstract thought : speculation

3. : the general or abstract principles of a body of fact, a science, or an art

music theory


a. : a belief, policy, or procedure proposed or followed as the basis of action

her method is based on the theory that all children want to learn

b. : an ideal or hypothetical set of facts, principles, or circumstances — often used in the phrase in theory

in theory , we have always advocated freedom for all

5. : a plausible or scientifically acceptable general principle or body of principles offered to explain phenomena

the wave theory of light


a. : a hypothesis assumed for the sake of argument or investigation

b. : an unproved assumption : conjecture

c. : a body of theorems presenting a concise systematic view of a subject

theory of equations

Synonyms: see hypothesis

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.