Evacuation

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late Middle English (in the sense ‘clear the contents of’): from Latin evacuat- ‘(of the bowels) emptied’, from the verb evacuare, from e- (variant of ex- ) ‘out of’ + vacuus ‘empty’.

wiktionary

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From Old French evacuation, from Late Latin ēvacuātiō.

etymonline

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evacuation (n.)

c. 1400, "discharge from the body" (originally mostly of blood), from Old French évacuation and directly from Late Latin evacuationem (nominative evacuatio), noun of action from past participle stem of evacuare "to empty" (see evacuate). Military sense is by 1710. Of persons, by 1854.