LATIN DICTIONARYLexicon Latīnum
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“conventional” in Latin

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

conventional
quod fit (etc.) ex pacto, ex foedere, ex conventu (Auct. ad Her., 2, 13, extr.), or ex convento (Cic., Att., 6, 3, 7). (the words are found in this connection and order), ex pacto et convento. [ ☞ conventionalis, founded on, or relating to, a convention; e.g., conventionalis stipulatio, Pomp. and Ulp., Dig., 45, 1, 5 and 52.] Conventional, arrangements, pacta: pactiones.
The word is sometimes used in a wider sense for what is arranged by a tacit agreement or understanding; perhaps usu receptus (Plin.): tralaticius (handed down from father to son; a matter of routine).

Quick answer

What is the Latin word for conventional?
The usual Latin words for “conventional” are trālātīcius, pangō, pactiō. 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.