ace - Dictionary definition and pronunciation - Yahoo! Education
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ace  audio  (s) KEY 

NOUN:
    1. A single spot or pip on a playing card, die, or domino.
    2. A playing card, die, or domino having one spot or pip.
  2. In racket games:
    1. A serve that one's opponent fails to hit.
    2. A point scored by such a serve.
  3. The act of hitting a golf ball in the hole with one's first shot.
  4. A military aircraft pilot who has destroyed five or more enemy aircraft.
  5. An expert in a given field.
ADJECTIVE:
Top-notch; first-rate.
TRANSITIVE VERB:
aced, ac·ing, ac·es
  1. To serve an ace against in racket games.
  2. To hit an ace on (a hole) in golf.
  3. Slang To get the better of (someone): a candidate who aced his opponents in the primaries.
  4. Slang
    1. To receive a grade of A on: She aced the exam.
    2. To perform with distinction on: aced the interview.

IDIOMS:
ace in the hole/up one's sleeve
A hidden advantage or resource kept in reserve until needed.
within an ace of
On the verge of; very near to: came within an ace of losing the election.
ETYMOLOGY:
Middle English as, from Old French, from Latin, unit


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