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1a 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
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- 2(informal) a person who is very good at doing something 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
a secret advantage, for example a piece of information or a skill, that you are ready to use if you need to
to have all the advantages in a situation The union soon realized that the management held all the aces.
to use your best argument, etc. in order to get an advantage in a situation
Check pronunciation: ace