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Medical Definition of Deja vu phenomenon
1. The mental impression that a new experience (e.g., a scene, sight, sound, or action) has happened before; a common phenomenon in normal persons that may occur more frequently or continuously in certain emotional or organic disorders. Also variously referred to as deja entendu, deja eprouve, deja fait, deja pense, deja raconte, deja vecu, or deja voulu, depending on the experience or sense that is evoked. (05 Mar 2000)