LATIN DICTIONARYLexicon Latīnum
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“commissary” in Latin

The English word commissary itself goes back to Latin committō, through commissarius.

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

commissary
curator (he that takes care of anybody’s business in general, e.g., agent of the Adriatic maritime company, curator corporis maris Hadriatici: Inser.): recuperator (judge to decide questions relating to property and pecuniary transactions, appointed by the praetor: to nominate such, dare recuperatores.) OBSERVE, not cognitor, nor inquisitor (Dict., and Schutz, Lex: Cic., under the words).
Commissary (military), annonae praefectus (at Rome, Liv., 4, 13): rei frumentariae praefectus (in Hirt., B.G., 8, 35: frumentarius = qui frumentum in oppidum importat): qui res, quas belli usus poscunt, subministrat. A board of commissaries, *duumviri (according to the number) rebus, quas belli usus poscunt, subministrandis.

Quick answer

What is the Latin word for commissary?
The usual Latin words for “commissary” are cūrō, cognitor, frūmentārius. 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.