Source : Webster's Revised Unabridged Dictionary (1913)

Ace \Ace\, n.; pl. {Aces}. [OE. as, F. as, fr. L. as, assis,
   unity, copper coin, the unit of coinage. Cf. {As}.]
   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.

   {To bate an ace}, to make the least abatement. [Obs.]

   {Within an ace of}, very near; on the point of. --W. Irving.

Ace \Ace\, n.
   A single point won by a stroke, as in handball, rackets,
   etc.; in tennis, frequently, a point won by a service stroke.

Source : WordNet®

ace
     v 1: succeed at easily; "She sailed through her exams"; "You will
          pass with flying colors"; "She nailed her astrophysics
          course" [syn: {breeze through}, {pass with flying colors},
           {sweep through}, {sail through}, {nail}]
     2: score an ace against; "He aced his opponents"
     3: play (a hole) in one stroke
     4: serve an ace against (someone)

ace
     n 1: the smallest whole number or a numeral representing this
          number; "he has the one but will need a two and three to
          go with it"; "they had lunch at one" [syn: {one}, {1}, {I},
           {single}, {unity}]
     2: one of four playing cards in a deck having a single pip on
        its face
     3: someone who is dazzlingly skilled in any field [syn: {adept},
         {champion}, {sensation}, {maven}, {mavin}, {virtuoso}, {genius},
         {hotshot}, {star}, {superstar}, {whiz}, {whizz}, {wizard},
         {wiz}]
     4: a major strategic headquarters of NATO; safeguards an are
        extending from Norway to Turkey [syn: {Allied Command
        Europe}]
     5: a serve that the receiver is unable to reach

ace
     adj : of the highest quality; "an ace reporter"; "a crack shot";
           "a first-rate golfer"; "a super party"; "played
           top-notch tennis"; "an athlete in tiptop condition";
           "she is absolutely tops" [syn: {A-one}, {crack}, {first-rate},
            {super}, {tiptop}, {topnotch}, {tops(p)}]

Source : Free On-Line Dictionary of Computing

ACE
     
        1. {Advanced Computing Environment}.
     
        2. {Adaptive Communication Environment}.