LATIN DICTIONARYLexicon Latīnum
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“assimilation” in Latin

The English word assimilation itself goes back to Latin simulō, through assimilatio.

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

assimilation
simulatio: assimulatio.
Of food: digestio: concoctio (digestio is, according to Cels., the passing of food, whether digested or not, to the proper parts of the body: concoctio is “digestion”).

Quick answer

What is the Latin word for assimilation?
The usual Latin words for “assimilation” are simulātiō, assimulātiō, dīgestiō; also concoctiō. 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.