procession (n.)youdaoicibaDictYouDict[procession 词源字典]
late Old English, "act of marching or proceeding," from Old French procession "procession" (religious or secular), 11c., and directly from Late Latin processionem (nominative processio) "religious procession," in classical Latin "a marching onward, a going forward, advance," noun of action from past participle stem of procedere (see proceed).[procession etymology, procession origin, 英语词源]