LATIN DICTIONARYLexicon Latīnum
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“weight” in Latin

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

weight
Measure or relation of heaviness; also heaviness itself; (a) PROP., pondus. Roman weight, Romana pondera, nominative plur., (Vid: Liv., 38, 38, quite at the end, talentum ne minus pondo octoginta Romanis ponderibus pendat; i. e., not less than eighty pounds in Roman weight): all things fall to the ground by their own weight, omnia pondere suo in terram feruntur: of great weight, gravis (opposed to levis); grandi pondere: a pound in weight, libram pondo (sc. valens; Vid: Liv., 3, 29): a thousand pounds’ weight of gold, mille (sc. libras) pondo auri (Liv., 5, 48, quite at the end): of the weight of a silver denarius, ad pondus argentei denarii pensum. (b) Figuratively. Importance, pondus: momentum (that which turns the scale, ῥοπή): auctoritas (authority, influence): vis: gravitas (power, force). Weight of words, pondus verborum (Vid: Quint., 10, 1, 97): a man of great weight, homo in quo summa auctoritas est et amplitudo (as a statesman); homo gravis (to whom much is usually assigned): words without weight, verba sine pondere: to have weight, gravem esse (of things and persons); aliquo numero atque honore esse (to stand in good repute; of persons): the thing has weight, res habet gravitatem: to have weight with anyone, pondus or aliquid ponderis habere apud aliquem (of things); aliquo loco et numero esse apud aliquem, numerum obtinere apud aliquem (of persons): to have great weight with anyone, magnum pondus habere, or maximi ponderis esse apud aliquem (of things); multum auctoritate valere or posse apud aliquem (of persons): to have no weight, nullius ponderis esse; ponderis nihil habere (of things); tenui or nulla auctoritate esse (of persons): to attach weight to anything, vim tribuere alicui rei: to give weight to a thing, alicui rei pondus afferre: weight of argument, vis; momentum; [Vid: COGENCY].
A body of a certain weight; (a) by which one weighs other bodies, pondus (general term; especially that which is placed in a scale): sacoma, -atis, neuter (σήκωμα, τό, weight hung on the other side of the balance or beam): aequipondium (so far as it forms a counterpoise to a heavy body). A false weight, pondera iniqua (Vid: Liv., 5, 48, quite at the end; to use such, adhibere): a stamped weight, pondus publice probatum (after Modestinus, Dig., 48, 10, 32, No. 1): to put weights in the scale, pondera in libram imponere: to buy or sell by weight, pondere emere or vendere: to give by weight, ad sacoma appendere: to weigh out, give or take anything by the weight of a silver denarius, aliquid ad pondus argentei denarii pendere (e.g., a medicine, etc.); to deliver anything by weight, ad sacoma pondus alicujus rei praestare (Vid: Vitr., 9, praef., §9 and 10).
That which one hangs on to anything; perhaps libramentum plumbi (with Liv., 24, 34).

Quick answer

What is the Latin word for weight?
The usual Latin words for “weight” are pondus, gravis, mīlle. 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.