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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.

late Middle English: from Old French departeure, from the verb departir (see depart).