LATIN DICTIONARYLexicon Latīnum
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“confluence” in Latin

The English word confluence itself goes back to Latin fluō, through cōnfluentia.

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

confluence
confiuens or confluentes (as the point of union of two rivers; e.g., of the Moselle and the Rhine, Mosellae et Rheni, Ammianus Marcellinus, 16, 3. If taking it as the act, it is to be expressed by the participle confiuens; e.g., “the confluence of the Rhone,” confiuens Rhodanus).
Concourse of people, concursus; concursatio. coetus (an assembly; Vid: ASSEMBLY): frequentia (a numerous concourse or assembly): conventus (concourse in concreto, assembly for any purpose).

Quick answer

What is the Latin word for confluence?
The usual Latin words for “confluence” are cōnfluēns, concurrō, concursātiō; also coitus, frequēns, conveniō. 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.