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“colloquy” in Latin

The English word colloquy itself goes back to Latin loquor, through colloquium.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

colloquy
collocutio (also in plur.): colloquium (a dialogue, as well for the purpose of entertainment as on business, compare Manut., Cic. ad Div., 1, 9, p. 84, cd. Richt.): to have a colloquy with anybody, cum aliquo colloqui: a secret colloquy, arcano or secreto cum aliquo colloqui. Vid: CONVERSATION.

Quick answer

What is the Latin word for colloquy?
The usual Latin words for “colloquy” are collocūtiō, colloquium, arcānus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.