What does 'departure' mean?

[rajeev]

Test No. incompl/inter-1 "Applying for that Job", question 10

After all these years she has decided to take early ..........

(a) leave
(b) finishing
(c) departure
(d) retirement

Test No. incompl/inter-1 "Applying for that Job", answer 10

After all these years she has decided to take early retirement.

Correct answer: (d) retirement
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how can we use departure in a sentence

[Torsten]

Departure is the act of leaving, of going away.

Example:

Please, arrive at the airport at least 2 hours before depature.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[[LGN]P@dre!]

Why can't be 'leave' used? For case if she was tired, wanted to have a rest...

[Mister Micawber]

.
In the case of leave, which is a temporary holiday, early makes no sense in terms of all these years. In addition, leave has no scheduled time, so that early again does not make practical sense.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber