evacuation (n.)youdaoicibaDictYouDict[evacuation 词源字典]
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.[evacuation etymology, evacuation origin, 英语词源]