LATIN DICTIONARYLexicon Latīnum
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“immortality” in Latin

The English word immortality itself goes back to Latin mortālis, through immortālitās.

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

immortality
immortalitas: aeternitas [SYN. in ETERNAL]. (The words are found in this connection and order.) aeternitas immortalitasque. An immortality of glory, immortalis or sempiterna gloria: the immortality of the soul, immortalitas or aeternitas animi, or animorum (☞ in this sense immortalitas must not be used alone, unless animi or animorum is implied by the context. Vid: Cic., Cat., Mae., 21, 78; Tusc., 1, 22, 50, and 33, 80). Plato’s book on the immortality of the soul, Platonis liber, qui immortalitatem animae docet: to maintain the immortality of the soul, dicere animos hominum esse immortales or sempiternos: to wish to establish or prove the immortality of the soul, hoc velle persuadere, non interire animas: to win immortality, immortalitatem consequi, or adipisci, or sibi parere (general term); immortalem or sempiternam gloriam consequi (an immortality of glory).

Quick answer

What is the Latin word for immortality?
The usual Latin words for “immortality” are immortālitās, aeternitās, immortālis; also animus, sempiternus. 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.