- a playing card or die marked with or having the value indicated by a single spot: He dealt me four aces in the first hand.
- a single spot or mark on a playing card or die.
- (in tennis, badminton, handball, etc.)
- a placement made on a service.
- any placement.
- a serve that the opponent fails to touch.
- the point thus scored.
- a fighter pilot credited with destroying a prescribed number or more of enemy aircraft, usually five, in combat.
- a very skilled person; expert; adept: an ace at tap dancing.
- a one-dollar bill.
- a close friend.
- Golf.
- a shot in which the ball is driven from the tee into the hole in one stroke: He hit a 225-yard ace on the first hole.
- a score of one stroke made on such a shot: to card an ace.
- a barbiturate or amphetamine capsule or pill.
- a very small quantity, amount, or degree; a particle: not worth an ace.
- a grade of A; the highest grade or score.
- (in tennis, badminton, handball, etc.) to win a point against (one's opponent) by an ace.
- to make an ace on (a hole).
- to cheat, defraud, or take advantage of (often followed by out): to be aced out of one's inheritance;friend who aced me out of a good job.
- Slang.
- to receive a grade of A, as on a test or in a course (sometimes followed by out).
- to complete easily and successfully: He aced every physical fitness test they gave him.
- to accomplish something with complete success: a champion who could ace it every time.
- an important, effective, or decisive argument, resource, or advantage kept in reserve until needed.
- to be highly regarded by: The boss says you're aces with him.
- aces equally divided between opponents.
- within a narrow margin of; close to: He came within an ace of winning.
- a person who experiences little or no sexual attraction to other people; asexual: She's an ace, but she's had a couple of romantic relationships.
- experiencing little or no sexual attraction to other people: As someone who identifies as ace, this article gave me much food for thought.
- American Council on Education.
- Army Corps of Engineers.
- any die, domino, or any of four playing cards with one spot
- a single spot or pip on a playing card, die, etc
- a winning serve that the opponent fails to reach
- a hole in one
- a fighter pilot accredited with destroying several enemy aircraft
- an expert or highly skilled person
- a hidden and powerful advantage
- to have all the advantages or power
- to use one's best weapon or resource
- almost to the point of
- superb; excellent
- to serve an ace against
- to play (a hole) in one stroke
- to perform extremely well or score very highly in (an examination, etc)
- (in Britain) Advisory Centre for Education; a private organization offering advice on schools to parents
- Allied Command Europe
- angiotensin-converting enzyme
