Pronunciation: (di-pär'chur),[key] —n. 1. an act or instance of departing: the time of departure; a hasty departure. 2. divergence or deviation, as from a standard, rule, etc.: a departure from accepted teaching methods. 3. Navig. a. the distance due east or west traveled by a vessel or aircraft.
b. See point of departure. 4. Survey.the length of the projection, on the east-west reference line, of a survey line.