Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A single spot or pip on a playing card, die, or domino.
  • noun A playing card, die, or domino having one spot or pip.
  • noun In racket games.
  • noun A serve that one's opponent fails to hit.
  • noun A point scored by such a serve.
  • noun The act of hitting a golf ball in the hole with one's first shot.
  • noun A military aircraft pilot who has destroyed five or more enemy aircraft.
  • noun An expert in a given field.
  • adjective Top-notch; first-rate.
  • transitive verb To serve an ace against in racket games.
  • transitive verb To hit an ace on (a hole) in golf.
  • transitive verb Slang To get the better of (someone).
  • transitive verb To receive a grade of A on.
  • transitive verb To perform with distinction on.
  • idiom (ace in the hole/up one's sleeve) A hidden advantage or resource kept in reserve until needed.
  • idiom (within an ace of) On the verge of; very near to.

from The Century Dictionary.

  • noun A noun-suffix occurring in populace, pinnace, etc. (which see). It is not used as an English formative. In menace, grimace, and other words, the suffix is of different origin.
  • noun A unit; specifically, a single pip on a card or die, or a card or die marked with a single pip.
  • noun A very small quantity; a particle; an atom; a trifle: as, the creditor will not abate an ace of his demand.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective of the highest quality.
  • verb colloq. to get a grade of "A".
  • noun A unit; a single point or spot on a card or die; the card or die so marked.
  • noun Hence: A very small quantity or degree; a particle; an atom; a jot.
  • noun (Sport) A single point won by a stroke, as in handball, rackets, etc.; in tennis, frequently, a point won by a service stroke.
  • noun to make the least abatement. [Obs.]
  • noun very near; on the point of.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A single point or spot on a playing card or die.
  • noun A card or die face so marked.
  • noun A very small quantity or degree; a particle; an atom; a jot.
  • noun tennis A serve won without the opponent hitting the ball.
  • noun baseball The best pitcher on the team.
  • noun baseball, dated, 19th century A run.
  • noun golf A hole in one.
  • noun An expert at something.
  • noun A military aircraft pilot who is credited with shooting down five or more enemy aircraft.
  • noun A perfect score on a school exam.
  • verb To pass (a test, interviews etc.) perfectly.
  • verb tennis To win a point by an ace.
  • verb golf To make an ace (hole in one).
  • adjective UK, slang Excellent.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective of the highest quality
  • verb succeed at easily
  • verb score an ace against
  • verb play (a hole) in one stroke
  • verb serve an ace against (someone)
  • noun the smallest whole number or a numeral representing this number
  • noun one of four playing cards in a deck having a single pip on its face
  • noun a major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English as, from Old French, from Latin, unit.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Middle English as, from Old French as, from Latin as, assis, unity, copper coin, the unit of coinage. Compare as

Examples

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