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“decisive” in Latin

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

decisive
decretorius (post-Augustan): quod habet or facit momentum (what gives a decisive turn): ultimus (what is decisive, as being last; e.g., a battle, a cause): the decisive hour, hora decretoria; ultimi discriminis tempus (approaches, adventat): a decisive moment, *momentum, quo fortuna in discrimen vocatur; temporis discrimen: a decisive battle, pugna decretoria (Quint. 6, 4, 6); proelium, in quo omnis fortuna reipublicae disceptat (on the result of which the fate of the republic depends, Cic., ad Div., 10, 10, 2); also ultima, or universae rei dimicatio (Liv. 1, 15, and 38): an engagement, which is not decisive, proelium anceps: to hazard a decisive battle, summis cum hoste copiis contendere (Herz., Caes. B.G., 5, 17); de summa rerum decernere: it comes to a decisive battle, venit res ad ultimum dimicationis; venit in casum universae dimicationis: no decisive battle was fought, nusquam ad universae rei dimicationem ventum est.

Quick answer

What is the Latin word for decisive?
The usual Latin words for “decisive” are dēcrētōrius, ultimus, adventō; also proelium. 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.