1. • 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 - someone who is dazzlingly skilled in any field
   • noun - proteolytic enzyme that converts angiotensin I into angiotensin II
   • noun - a major strategic headquarters of NATO
   • noun - a serve that the receiver is unable to reach
   • verb - succeed at easily
   • verb - score an ace against
   • verb - play (a hole) in one stroke
   • verb - serve an ace against (someone)
   • adj - of the highest quality
2. • Games.
   • A single spot or pip on a playing card, die, or domino.
   • A playing card, die, or domino having one spot or pip.
   • Sports.
   • A serve that one’s opponent fails to return.
   • A point scored by such a serve.
   • The act of hitting a golf ball in the hole with one’s first shot.
   • A military aircraft pilot who has destroyed five or more enemy aircraft.
   • Topnotch; first-rate.
   • To serve an ace against.
   • To hit an ace in golf.
   • Slang.
   • To receive a grade of A on: She aced the exam.
3. • v - to score a point against in a single stroke

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