LATIN DICTIONARYLexicon Latīnum
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“interposition” in Latin

The English word interposition itself goes back to Latin interpositiō.

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

interposition
interpositio (e.g., certarum personarum interpositio; Cic., Invent., 1, 6): interpositus, -ūs (e.g., luna interpositu interjectuque terrae repente deficit; Cic., only of local interposition): interventus, -ūs (of persons; e.g., alicujus; Caleni et Calvenae; interventu Pomptini pugna sedatur; also of things; local, lunae, noctis, etc.: ☞ of persons, it denotes simply the coming in before anything is completed, which they may or may not hinder; in the sense of mediation, etc., it is post-classical; alicui rei subvenire interventu principis; Plin., Ep., 10, 68). By the interposition of anybody, alicujus beneficio (☞ Herzog, Caes., B.G., 1, 33).

Quick answer

What is the Latin word for interposition?
The usual Latin words for “interposition” are interpositiō, interpōnō, interventus; also lūna, 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.