LATIN DICTIONARYLexicon Latīnum
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“intervene” in Latin

The English word intervene itself goes back to Latin veniō, through interveniō.

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

intervene
intervenire: supervenire (to come upon anybody unexpectedly; of persons or things; e.g., of night, ni nox proelio intervenisset, Liv., ; quotiens imbres superveniunt; Front., Aquaed., 15): intercedere alicui rei (of time, annus, nox, Cic.): interponi (of time, spatio interposito): objici (of hinderances). Scarcely a year had intervened, before (or when), etc., vix annus intercesserat, qnum, etc.

Quick answer

What is the Latin word for intervene?
The usual Latin words for “intervene” are interveniō, superveniō, interpōnō; also obiciō, annus, nox. 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.