protestation (n.)youdaoicibaDictYouDict[protestation 词源字典]
mid-14c., "affirmation;" late 14c., "avowal, declaration, assertion," from Old French protestacion "protest, protestation" (13c.) and directly from Latin protestationem (nominative protestatio) "a declaration, protestation," noun of action from past participle stem of protestari (see protest (n.)).[protestation etymology, protestation origin, 英语词源]