departure -
n. 1 the act or an
instance of departing.
2 (often foll. by from) a deviation (from the truth, a standard, etc.).
3 (often attrib.) the starting of a train, an aircraft, etc. (the
departure was late;
departure lounge).
4 a new course of
action or thought (driving a car is rather a
departure for him).
5 Naut. the amount of a ship's change of longitude.
[OF departe] 
