noun
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.
Navigation.
the distance due east or west traveled by a vessel or aircraft.
point of departure.
4.
Surveying. the length of the projection, on the east-west reference line, of a survey line.
5.
Archaic. death.