LATIN DICTIONARYLexicon Latīnum
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“mission” in Latin

The English word mission itself goes back to Latin mittō, through missiō.

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

mission
The act of sending, missio.
Office of one sent, munus; partes, plur.; mandatum.
Embassy for the propagation of religion, *legatio Christianae doctrinae or religionis propagandas gratia missa; *legatio, quae Christianae doctrinae apud barbaras gentes propagandae gratia missa est.

Quick answer

What is the Latin word for mission?
The usual Latin words for “mission” are missiō, mūnus, pars; also mandō, lēgātiō. 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.