departure
n. C / Un. the act of leaving a place, especially to start a journey. It can also mean a change from the usual way of doing things.
n. the act of leaving or starting a journey; a deviation from an established course, plan, or standard practice.
The flight's departure is scheduled for ten in the morning.
The team's new strategy represents a significant departure from their traditional defensive style of play.
Passengers are advised to arrive at the terminal three hours before their scheduled departure to allow sufficient time for security screenings and baggage handling.
From Old French deporteure (“departure; figuratively, death”). By surface analysis, depart + -ure.
Countable when referring to specific instances of leaving or changes in plan; uncountable when referring to the general concept of leaving.
the departure to Londonthe departure for LondonWhen indicating a destination after 'departure', the preposition 'for' is standard, whereas 'to' is used with 'trip' or 'journey'.