supplication (n.)youdaoicibaDictYouDict[supplication 词源字典]
late 14c., from Old French suplicacion "humble request," from Latin supplicationem (nominative supplicatio) "a public prayer, thanksgiving day," noun of action from past participle stem of supplicare "plead humbly" (see supple). In ancient Rome, a religious solemnity, especially in thanksgiving for a victory or in times of public danger.[supplication etymology, supplication origin, 英语词源]