D defs.my
Entry 5 senses · 3 variants Webster, 1913

Ace

/(ās)/ · IPA /eɪs/
01 n. A unit; a single point or spot on a card or die; the card or die so marked; as, the ace of diamonds.
pl. Aces ((ā"sĕz))
  1. 1.
    A unit; a single point or spot on a card or die; the card or die so marked; as, the ace of diamonds.
  2. 2.
    Hence: A very small quantity or degree; a particle; an atom; a jot.
    “I 'll not wag an ace further.” Dryden.
  3. 3.
    A single point won by a stroke, as in handball, rackets, etc.; in tennis, frequently, a point won by a service stroke.(Sport)
Phrases & compounds
To bate an ace — to make the least abatement. [Obs.]
Within an ace of — very near; on the point of.
02 adj. of the highest quality
  1. 1.
    of the highest quality
03 v. to get a grade of "A"; as, to ace an exam.
  1. 1.
    to get a grade of "A"; as, to ace an exam.[Colloq.]