Quick definitions from WordNet (ace)

▸ 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 ("He aced his opponents")
▸ verb:  succeed at easily
▸ adjective:  of the highest quality ("An ace reporter")
▸ name:  A surname (very rare: popularity rank in the U.S.: #38729)

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▸ Also see ace