Pronunciation: (toor" du fôrs', -fōrs'; Fr. tOOr du fôrs'),[key] —pl.tours de forcePronunciation: (toorz" du fôrs', -fōrs'; Fr. tOOr du fôrs').[key] 1. an exceptional achievement by an artist, author, or the like, that is unlikely to be equaled by that person or anyone else; stroke of genius: Herman Melville's Moby Dick was a tour de force. 2. a particularly adroit maneuver or technique in handling a difficult situation: The way the president got his bill through the Senate was a tour de force. 3. a feat requiring unusual strength, skill, or ingenuity.