usurpation (n.)youdaoicibaDictYouDict[usurpation 词源字典]
late 14c., from Old French usurpacion, from Latin usurpationem (nominative usurpatio) "a taking into use," noun of action from past participle stem of usurpare (see usurp).[usurpation etymology, usurpation origin, 英语词源]