LATIN DICTIONARYLexicon Latīnum
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“alteration” in Latin

The English word alteration itself goes back to Latin alter, through alterātiō.

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

alteration
mutatio: commutatio: immutatio: conversio (Syn. s. verbs under ALTER, transitive): varietas, vicissitudo (the first more accidental, the last regular). Alteration of the weather, caeli varietas: alterations of fortune, fortunae vicissitudines. Alteration of opinion, mutatio sententiae: receptus sententiae (retractation): to make an alteration, mutationem or commutationem alicujus rei facere [Vid. ALTER, transitive]: to cause an alteration, commutationem alicui rei afferre: to undergo or be subject to an alteration, mutationem habere: to plan or endeavor to effect an alteration, mutationem moliri. An alteration of circumstances is taking place, commutatio rerum accidit. Alteration of color, mutatio coloris: of plan, consilii: of the state of things, rerum conversio.

Quick answer

What is the Latin word for alteration?
The usual Latin words for “alteration” are mūtātiō, commūtātiō, immūtātiō; also conversiō, varietās, vicissitūdō. 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.