Ace n.; pl. Aces
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. Hence: A very small quantity or degree; a particle; an atom; a jot.
I 'll not wag an ace further. --Dryden.
3. Sport A single point won by a stroke, as in handball, rackets, etc.; in tennis, frequently, a point won by a service stroke.
To bate an ace, to make the least abatement. [Obs.]
Within an ace of, very near; on the point of.