LATIN DICTIONARYLexicon Latīnum
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“quantity” in Latin

The English word quantity itself goes back to Latin quantus, through quantitās.

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

quantity
quantitas (Plin.); copia: numerus (Cic.): a great quantity, magnus numerus; multum: a considerable quantity, aliquot (of number): aliquantum (of quantity, with genitive, e.g., auri): in quantity, copiosus; adverb, copiose: (in prosody) *mensura, *quantitas (grammatical).

Quick answer

What is the Latin word for quantity?
The usual Latin words for “quantity” are quantitās, cōpia, numerus; also multus, aliquot, aliquantus. 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.