<p><strong>Noun:</strong></p><ul><li>Also called mate.</li><li>Chess: an act or instance of maneuvering the opponent's king into a check from which it cannot escape, thus bringing the game to a victorious conclusion.</li><li>The position of the pieces when a king is checkmated.</li><li>A complete check; defeat: His efforts to escape met with a checkmate.</li></ul><p><strong>Verb (used with object):</strong></p><ul><li>Checkmated, checkmating.</li><li>Chess: to maneuver (an opponent's king) into a check from which it cannot escape; mate.</li><li>To check completely; defeat: Napoleon was checkmated at Waterloo.</li></ul><p><strong>Interjection:</strong></p><ul><li>Chess: (used by a player to announce that they have put the opponent's king into inextricable check).</li></ul>