counsellor (n.)youdaoicibaDictYouDict[counsellor 词源字典]
early 13c., from Old French conseillier (Modern French conseiller), from Latin consilator, agent noun from consiliare, from consilium (see counsel (v.)). Meaning "one who gives professional legal advice" is from 1530s. Psychological sense (marriage counsellor, etc., is from 1940).[counsellor etymology, counsellor origin, 英语词源]