colloquy (n.)youdaoicibaDictYouDict[colloquy 词源字典]
mid-15c., "discourse," from Latin colloquium "conference, conversation," literally "a speaking together," from com- "together" (see com-) + -loquium "speaking," from loqui "to speak" (see locution). Meaning "conversation" is attested in English from 1580s.[colloquy etymology, colloquy origin, 英语词源]