Meaning of APPROXIMATION in English

APPROXIMATION

/ əˌprɒksɪˈmeɪʃn; NAmE əˌprɑːk-/ noun

1.

an estimate of a number or an amount that is almost correct, but not exact :

That's just an approximation, you understand.

2.

approximation (of / to sth) a thing that is similar to sth else, but is not exactly the same :

Our results should be a good approximation to the true state of affairs.

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