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.
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
[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.
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
APEC Cooperation for Earthquake Simulation (org., Australia,
China, Japan, USA)