From The Collaborative International Dictionary of English v.0.48:
ace \ace\ adj.
1. of the highest quality an ace reporter
Syn: A-one, first-class, first-rate, super, tip-top,
topnotch(predicate)
[WordNet 1.5]
From The Collaborative International Dictionary of English v.0.48:
ace \ace\ v.
to get a grade of "A"; as, to ace an exam. [Colloq.]
[PJC]
From The Collaborative International Dictionary of English v.0.48:
Ace \Ace\ ([=a]s), n.; pl. Aces ([=a]"s[e^]z). [OE. as, F. as,
fr. L. as, assis, unity, copper coin, the unit of coinage.
Cf. As.]
[1913 Webster]
1. A unit; a single point or spot on a card or die; the card
or die so marked; as, the ace of diamonds.
[1913 Webster]
2. Hence: A very small quantity or degree; a particle; an
atom; a jot.
[1913 Webster]
I 'll not wag an ace further. --Dryden.
[1913 Webster]
3. (Sport) A single point won by a stroke, as in handball,
rackets, etc.; in tennis, frequently, a point won by a
service stroke.
[Webster 1913 Suppl.]
To bate an ace, to make the least abatement. [Obs.]
Within an ace of, very near; on the point of. --W. Irving.
[1913 Webster]