What is Ace?

Ace definition and meaning on Dictionary terms:
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.) Also called service ace. 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.
Slang. a one-dollar bill.
Slang. a close friend.
Golf. Also called hole in one. 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.

Slang. a barbiturate or amphetamine capsule or pill.
a very small quantity, amount, or degree; a particle: not worth an ace.
Slang. a grade of A; the highest grade or score.

verb (used with object), aced,
(in tennis, badminton, handball, etc.) to win a point against (one’s opponent) by an ace.
Golf. to make an ace on (a hole).

Slang. to cheat, defraud, or take advantage of (often followed by out): to be aced out of one’s inheritance; a 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.

excellent; first-rate; outstanding.

Verb Phrases
ace it, Slang. to accomplish something with complete success: a champion who could ace it every time.