assistant (n.)youdaoicibaDictYouDict[assistant 词源字典]
mid-15c., assistent "one who helps or aids another," from Middle French assistent, adjective and noun, properly present participle of assister (see assist (v.)).[assistant etymology, assistant origin, 英语词源]
assistant (adj.)youdaoicibaDictYouDict
mid-15c., "helpful, of assistance," from Middle French assistent (see assistant (n.)).