LATIN DICTIONARYLexicon Latīnum
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“diplomatic” in Latin

The English word diplomatic itself goes back to Latin diplōmaticus.

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

diplomatic
by the genitives legationis or legationum; legati or legatorum (☞ legatoria provincia is doubtful: according to Orelli, a false reading, for locatoria provincia, Cic., Att., 15, 9, 1) :a diplomatic post, legationis or legati munus; *legati provincia: a diplomatic dinner, epulum legatorum (Inscr.); convivium, quo legati pascuntur (after Eutropius, 4, 7, extr.): the diplomatic corps or body, corpus legatorum: to go to a place in a diplomatic character, legatum aliquo venire.

Quick answer

What is the Latin word for diplomatic?
The usual Latin words for “diplomatic” are lēgātiō, legō, post; also convīvium. 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.