LATIN DICTIONARYLexicon Latīnum
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“duration” in Latin

The English word duration itself goes back to Latin dūrus, through dūrātiō.

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

duration s.
tempus, spatium (time during which anything lasts; e.g., vitae): temporis spatium; diuturnitas; longinquitas (Cic.): Infinite duration, perennitas (Cic.).

Quick answer

What is the Latin word for duration?
The usual Latin words for “duration” are tempus, spatium, diūturnitās; also longinquitās, vīta, pĕrennĭtas. 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.