• within a narrow margin of; close to
  • a die face marked with one spot
  • playing card marked in its center with one pip
  • domino end marked with one spot
  • very small amount or degree particle
  • point scored especially on a service (as in tennis or handball) that an opponent fails to touch
  • golf score of one stroke on a hole
  • hole made in one stroke
  • combat pilot who has brought down at least five enemy airplanes
  • person who excels at something a computer ace
  • playing card with one spot
  • expert
  • to do very well on
  • American Council on Education
  • Army Corps of Engineers
  • to accomplish something with complete success
  • important, effective, or decisive argument, resource, or advantage kept in reserve until needed
  • to be highly regarded by
  • aces equally divided between opponents
  • to score a point against in a single stroke [v ACED, ACES, ACING]
  • to serve an unreturnable shot eg in tennis [v ACED, ACING, ACES]