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Definition of ace noun from the Oxford Advanced American Dictionary

ace

noun
/eɪs/ ace pronunciation American
 
1 a playing card with a large single symbol on it, which has either the highest or the lowest value in a particular card gamethe ace of spades/hearts/diamonds/clubs2 (informal) a person who is very good at doing somethinga soccer/flying acean ace marksman3 (in tennis) a serve (= the first hit) that is so good that your opponent cannot reach the ballHe served 20 aces in the match.IDIOMS

an ace in the hole

(informal) a secret advantage, for example a piece of information or a skill, that you are ready to use if you need toan ace in the hole

hold all the aces

to have all the advantages in a situation
The union soon realized that the management held all the aces.hold all the aces

play your ace

to use your best argument, etc. in order to get an advantage in a situation
play your ace