LATIN DICTIONARYLexicon Latīnum
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“extermination” in Latin

The English word extermination itself goes back to Latin terminō, through exterminātiō.

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

extermination
internecio: excidium (= exscidium). War of extermination, bellum internecivum; bellum infinitum: to carry on a war of extermination, bellum ad internecionem gerere; bello internecivo certare; bellum gerere cum aliquo, uter sit, non uter imperet: ☞ internecivus (Freund) or internecinus.

Quick answer

What is the Latin word for extermination?
The usual Latin words for “extermination” are interneciō, excidium. 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.