LATIN DICTIONARYLexicon Latīnum
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“extinction” in Latin

The English word extinction itself goes back to Latin stinguō, through extinctio.

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

extinction
exstinctio (PROP. and IMPROP.): exstinctus, us (Plin.; ☞ restinctio only Cic., De Fin., 2, 3, extr.; in the sense of quenching thirst): interitus (IMPROP., the destruction and total loss of anything; e.g., legum, reipublicae, etc.). (The words are found in this connection and order.) occasus interitusque. To cause the extinction of anything, afferre interitum alicujus rei.

Quick answer

What is the Latin word for extinction?
The usual Latin words for “extinction” are exstīnctiō, exstinguō, intereō; also lēx, rēspūblica. 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.