councillor 的词源

“委员会成员”，15世纪初，这个词是通过与council的同化，改变自counselor。

The distinction of form and sense ( councilor, one of a council, counselor, one who counsels) is modern; there is no OF. or L. form corresponding to councilor (L. as if *conciliarius) as distinguished from counselor (L. consiliarius). [Century Dictionary]

形式和意义的区别（councilor，委员会成员，counselor，顾问）是现代的；没有对应于councilor的古法语或拉丁语形式（拉丁语似乎是*conciliarius），与counselor（拉丁语consiliarius）区分开来。[世纪词典]