1. a playing card with a single spot, ranking highest or lowest in various games
2. a person who is very skilled at something
Usage: informal
3. a serve in tennis that the opponent cannot return
Usage: tennis

1. to perform very well on a test or in a situation
Usage: informal

1. excellent or outstanding
Usage: informal

Examples

• She drew the ace of spades from the deck.
• He’s an ace at solving math problems.
• The tennis player served three aces in a row.
• The fighter pilot became an ace after his fifth victory.
• I hope to ace my history exam tomorrow.
• That was an ace performance by the band.
• The ace detective solved the case quickly.
• She’s the ace pitcher on our baseball team.