Meaning of THEORY in English

THEORY

(theories)

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

1.

A ~ 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 ~ about something, you have your own opinion about it which you cannot prove but which you think is true.

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

N-COUNT

3.

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

He taught us music ~.

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

4.

You use in ~ 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 ~, but in practice, there are few dentists to work in them.

= theoretically

PHRASE: PHR with cl

Collins COBUILD.      Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) .