<p><strong>Noun</strong></p><ul><li>a playing card or die marked with or having the value indicated by a single spot: He dealt me four aces in the first hand.</li><li>a single spot or mark on a playing card or die.</li><li>(in tennis, badminton, handball, etc.) Also called service ace: a placement made on a service; any placement.</li><li>a serve that the opponent fails to touch; the point thus scored.</li><li>a fighter pilot credited with destroying a prescribed number or more of enemy aircraft, usually five, in combat.</li><li>a very skilled person; expert; adept: an ace at tap dancing.</li><li>Slang: a one-dollar bill.</li><li>Slang: a close friend.</li><li>Golf: Also called hole in one: a shot in which the ball is driven from the tee into the hole in one stroke: He hit a 225-yard ace on the first hole.</li><li>a score of one stroke made on such a shot: to card an ace.</li><li>Slang: a barbiturate or amphetamine capsule or pill.</li><li>a very small quantity, amount, or degree; a particle: not worth an ace.</li><li>Slang: a grade of A; the highest grade or score.</li></ul><p><strong>Adjective</strong></p><ul><li>sometimes aces: excellent; first-rate; outstanding.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>(in tennis, badminton, handball, etc.) to win a point against (one's opponent) by an ace.</li><li>Golf: to make an ace on (a hole).</li><li>Slang: to cheat, defraud, or take advantage of (often followed by out): to be aced out of one's inheritance; friend who aced me out of a good job.</li><li>Slang: to receive a grade of A, as on a test or in a course (sometimes followed by out).</li><li>to complete easily and successfully: He aced every physical fitness test they gave him.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>Slang: to accomplish something with complete success: a champion who could ace it every time.</li></ul>