departure
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noun
the action of leaving, especially to start a journey:
«…からの/…への» 出発, 立ち去ること; (列車などの)発車 (!具体例ではa ～; その際しばしば修飾語を伴う) ; C出発便 «from/for» (↔ arrival)
e.g. the day of departure
e.g. she made a hasty departure.
a deviation from an accepted, prescribed, or traditional course of action or thought:
〖a ～〗 【通常の方法などからの】逸脱, 離反,逸れること «from» ; 【考え方などの】新展開, 発展 «in»
e.g. a departure from their usual style.
Nautical the east–west distance between two points, especially as traveled by a ship or aircraft and expressed in miles.
ORIGIN
late Middle English: from Old French departeure, from the verb departir (see depart).