LATIN DICTIONARYLexicon Latīnum
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“positive” in Latin

The English word positive itself goes back to Latin pōnō, through positivus.

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

positive
verus (true, real): certus (certain, sure): in re positus (not nominal): re (opposed to verbo, verbis; in fact, not merely in report): pertinax in sententia sua tuenda (confident in assertion).
Affirmative, not negative, ajens (opposed to negans); affirmans (☞ affirmativus is late).
Receiving its binding force from enactment, quod constitutione continetur (e.g., justum; opposed to quod natura continetur, what is binding antecedently to or without enactment, Quint., 7, 4, 5): a positive law, lex scripta (opposed to lex nata): jus civile (opposed to jus naturale): positive religion, *religio lege sancita: what is positive, statio (opposed to natura, Vitr., 1, 2, 5): constitutio (Quint., 7, 4, 5).
Positive degree (grammatical), positivus gradus, or positivus only (Prisc.): in the positive, absolutus (opposed to comparativus; e.g., utimur vulgo comparativis pro absolutis, Quint., 9, 3, 19; conf. Gell., 5, 21, 13, in ea episto la scriptum est, pluria sive plura absolutum esse sive simplex; non, ut tibi videtur, comparativum).

Quick answer

What is the Latin word for positive?
The usual Latin words for “positive” are vērus, certus, aiō; also affirmō, verbum, iūstus. 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.