LATIN DICTIONARYLexicon Latīnum
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“congress” in Latin

The English word congress itself goes back to Latin veniō, through congressum.

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

congress
meeting (especially that of plenipotentiaries): conventus; concilium: congressio: congressus (any, especially friendly, meeting, interview, etc., the former as act, the latter as state, opposed to digressio, digressus). The congress of the Greeks at Thermopylae, conventus Pyliacus; commune Graeciae concilium: to hold a congress, conventum agere; in aliquem locum convenire.
The body of such plenipotentiaries, apocleti; legati.

Quick answer

What is the Latin word for congress?
The usual Latin words for “congress” are conveniō, concilium, congressiō; also congressus, legō, dīgredior. 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.