Meaning of ACE in English

ACE

/ eɪs; NAmE / noun , adjective

■ noun

1.

a playing card with a large single symbol on it, which has either the highest or the lowest value in a particular card game :

the ace of spades / hearts / diamonds / clubs

2.

( informal ) a person who is very good at doing sth :

a soccer / flying ace

an ace marksman

3.

( in tennis ) a serve (= the first hit) that is so good that your opponent cannot reach the ball :

He served 20 aces in the match.

IDIOMS

- an ace up your sleeve

- hold all the aces

- play your ace

- within an ace of sth / of doing sth

■ adjective

( informal ) very good :

We had an ace time.

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WORD ORIGIN

Middle English (denoting the “one” on dice): via Old French from Latin as unity, a unit.

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