LATIN DICTIONARYLexicon Latīnum
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“mortality” in Latin

The English word mortality itself goes back to Latin mors, through mortālitās.

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

mortality
State of being subject to death, mortalitas; mortalis conditio or natura.
Death, mors, interitus, obitus. [Vid: DEATH.]
Frequency of death, numerus mortuorum: there was a great mortality that year, permulti homines eo anno mortui sunt or morte absumti sunt:
Human nature, mortals, homines (plur.).

Quick answer

What is the Latin word for mortality?
The usual Latin words for “mortality” are mortālitās, nātūra, mors; also intereō, obeō, homō̆. 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.