• noun:   a serve that the receiver is unable to reach
• 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:   a major strategic headquarters of NATO; safeguards an are extending from Norway to Turkey
• noun:   the smallest whole number or a numeral representing this number
• verb:   serve an ace against (someone)
• verb:   play (a hole) in one stroke
• verb:   score an ace against

  Example: "He aced his opponents"

• verb:   succeed at easily
• adjective:   of the highest quality

  Example: "An ace reporter"

• name:  A surname (very rare: popularity rank in the U.S.: #38729)

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