LATIN DICTIONARYLexicon Latīnum
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“congregation” in Latin

The English word congregation itself goes back to Latin gregō, through congregātiō.

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

congregation
congregatio (act of assembling): convocatio: conventus (an assembly): coetus: corona: consessus.
Congregation = body assembled at church, *coetus sacer. = Church, ecclesia, populus Christianus. perhaps conventus the best word for the congregation, = “members of any sect in a country;” e.g., *conventus Lutheranus.

Quick answer

What is the Latin word for congregation?
The usual Latin words for “congregation” are congregātiō, convocātiō, conveniō; also coitus, corōna, cōnsīdō. 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.