ace Definition in the Cambridge English Dictionary
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Definition of “ace” - English Dictionary

Definition of "ace" - American English Dictionary

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acenoun [C]

 us   /eɪs/

ace noun [C] (PLAYING CARD)

one of the four ​playingcards with a ​singlemark or ​spot, which have the ​highest or ​lowestvalue in many ​cardgames

ace noun [C] (TENNIS)

a serve (= ​hit of the ​ball that ​startsplay) in ​tennis that is so ​strong and ​fast the other ​player cannot ​return the ​ball

ace noun [C] (SKILLED PERSON)

infml a ​person who is ​unusually good at doing something ​skillful: Yankee ace Chien-Ming Wang will ​pitch tonight’s ​game.
(Definition of ace from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "ace" - British English Dictionary

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acenoun [C]

uk   us   /eɪs/

ace noun [C] (PLAYING CARD)

one of the four ​playingcards with a ​singlemark or ​spot. The ace has the ​highest or ​lowestvalue in many ​cardgames: the ace of ​hearts/​clubs/​spades/​diamonds

ace noun [C] (SKILLED PERSON)

informal a ​person who is very ​skilled at something: a ​tennis/​flying ace

ace noun [C] (TENNIS)

in ​tennis, a serve (= a ​hit of the ​ball that ​startsplay) that is so ​strong and ​fast that the other ​player cannot ​return the ​ball: That's the third ace Lawson has served this ​match.

aceverb [T]

uk   us   /eɪs/ US informal
to do very well in an ​exam: I was up all ​nightstudying, but it was ​worth it - I aced my ​chemistryfinal.

aceadjective

uk   us   /eɪs/ old-fashioned slang
excellent: He's an ace ​basketballplayer. That's an ace ​bike you've got there.
(Definition of ace from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "ACE" - Business English Dictionary

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ACEnoun

SOCIAL RESPONSIBILITY
abbreviation for Active Corps of Executives: an ​organization in the US that consists of ​workingexecutives who give ​freehelp and ​advice to ​smallbusinesses
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(Definition of ACE from the Cambridge Business English Dictionary © Cambridge University Press)
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