Meaning of THEORY in English

THEORY

transcription, транскрипция: [ θɪəri ]

( theories)

Frequency: The word is one of the 1500 most common words in English.

1.

A theory is a formal idea or set of ideas that is intended to explain something.

Einstein formulated the Theory of Relativity in 1905.

N-VAR : usu with supp

2.

If you have a theory about something, you have your own opinion about it which you cannot prove but which you think is true.

There was a theory that he wanted to marry her...

N-COUNT

3.

The theory of a practical subject or skill is the set of rules and principles that form the basis of it.

He taught us music theory.

N-UNCOUNT : usu with supp , supp N , N of n

4.

You use in theory to say that although something is supposed to be true or to happen in the way stated, it may not in fact be true or happen in that way.

A school dental service exists in theory, but in practice, there are few dentists to work in them.

= theoretically

PHRASE : PHR with cl

Collins COBUILD Advanced Learner's English Dictionary.      Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне.