theory - definition in the Learner's Dictionary - Cambridge Dictionaries Online (US)

Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “theory”

See all translations

theory

noun
 
 
/ˈθɪəri/
IDEA [C] B2 an idea or set of ideas that is intended to explain something: Darwin's theory of evolutionPhilosophyIdeas, concepts and theories
PRINCIPLES [U] the set of principles on which a subject is based: economic theoryPhilosophyIdeas, concepts and theories
in theory B2 If something is possible in theory, it should be possible but often it does not happen this way: In theory, the journey should be shorter but in practice, the roadworks slow you down.Ideas, concepts and theories
Translations of “theory”
in Arabic نَظَرِيّة…
in Korean 이론…
in Malaysian teori…
in French théorie…
in Turkish kuram, teori…
in Italian teoria…
in Chinese (Traditional) 理論, 學說, 意見…
in Russian теория…
in Polish teoria…
in Vietnamese lý thuyết, lý luận, nguyên lý…
in Spanish teoría…
in Portuguese teoria…
in Thai สมมติฐาน, ทฤษฎี…
in German die Theorie…
in Catalan teoria…
in Japanese 理論, 説…
in Indonesian teori…
in Chinese (Simplified) 理论, 学说, 意见…
(Definition of theory from the Cambridge Learners Dictionary © Cambridge University Press)
Add Cambridge dictionaries to your browser to your website

Definitions of “theory” in other dictionaries

Word of the Day

disappear off the face of the earth

to disappear completely

Word of the Day

The language of elections

by Liz Walter,
April 22, 2015
On May 7th, citizens of the UK will be going to the polls (having an election) to decide who will form the next government. This kind of election is known as a general election. The country is divided into 650 areas, called constituencies. Each constituency elects a member of parliament (MP) to

Read More 

dumbwalking noun

April 20, 2015
walking slowly, without paying attention to the world around you because you are consulting a smartphone He told me dumbwalking probably wouldn’t be a long-term problem.

Read More