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“durability, durableness” in Latin

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

durability, durableness s.
diuturnitas; longinquitas (Cic.): firmitas: soliditas: stabilitas [SYN. in DURABLE.] That has durability, firmus, solidus: to have durability [Vid: To BE DURABLE]: to give great durability to buildings, aedificiis praestare firmitates: not built for durability, *parum firme, parum solide aedificatum.

Quick answer

What is the Latin word for durability, durableness?
The usual Latin words for “durability, durableness” are diūturnitās, longinquitās, firmitās; also soliditās, stabiliō, firmus. 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.