IN THEORY


Meaning of IN THEORY in English

used to say that a particular statement is supposed to be true but may in fact be wrong :

In theory, these machines should last for ten years or more.

That sounds fine in theory, but have you really thought it through?

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.