acing

noun

1. a playing card, domino, etc. marked with one large, centered pip
2. Racket Sports, Handball
   1. a score made by a serve that one's opponent fails to touch
   2. such a serve
3. Golf the act of hitting the ball so that it goes into the hole on the drive; hole in one
4. a combat pilot who has destroyed at least five enemy planes
5. an expert in any activity

Origin: ME as, aas < L as, unit, unity, as

adjective

transitive verb aced, acing

1. to score an ace against, as in tennis
2. to make an ace on (a particular hole) in golf
3. Slang to defeat completely; get the best of: often with out
4. ☆ Informal to do very well, esp., by earning a grade of A, in, on, etc.: she aced the course