“reason” in Latin

ratio (faculty which calculates or deliberates): mens (understanding): sanitas (soundness of the mind, which displays itself in thinking and acting according to truth and right): prudentia: consilium (prudence, insight). Sound reason, ratio sana or recta, or integra: mens sana: sensus communis: naturalis or vulgaris prudentia (common sense). To follow sound reason, rectae rationi parere. Endowed with reason, ratione praeditus or utens: rationis particeps (☞ rationalis is first used by Sen., Ep., 113, 14). Without reason, ratione carens: rationis expers. To lose one’s reason, mentem amittere. To recover one’s reason, ad sanitatem reverti or redire: resipiscere: ad se redire: ad bonam frugem se recipere. To bring anybody to reason, ad bonam frugem corrigere or compellere: ad sanitatem adducere or perducere, or revocare.

Ground, cause, (efficient or final), causa: ratio [Vid :, CAUSE]. To state a reason, causam or rationem afferre. To be principally led by such or such a reason, aliquid or nonnihil sequi; (in anything), in aliqua re (Cic., Offic., 1, 11, 35, Beier., p. 81, sq.; Rosc., Am., 3, 8, Matthiae). I have good reasons for, etc., non sine gravi causa facio aliquid: graves causae me impellunt, ut faciam aliquid (i. e., I am guided by very strong reasons). I will admit your reasons, causam accipio. For no other reason whatever than that, nihil sane, nisi, ut (as answer to a question why he had done so and so; Cic., Leg., 1, 1). Not without reason, non sine causa: cum causa: For or from good reasons, justis de causis. Without any reason, nulla ratione; de nihilo (not Cic.; without any cause; e.g., hospites corripi; fiducia, quae non de nihilo profecto concepta est, Liv., 39, 29). Without the slightest reason, temere. There is no reason for it, or I have no reason, followed by “to” and infinitive, or by “why,” or “for” with the participial substantive; non est, nihil est, quod or cur; non habeo, nihil habeo, quod or cur (e.g., you have no reason to put yourself out, nihil est quod te moveat. I have reason to, etc., est quod (e.g., I have reason to be ashamed of myself, est quod me pudeat): what reason is there for, (to, or why), quid est, quod, quamobrem or cur (e.g., festines): what possible reason is there for, etc., quid tandem est, cur, etc. ☞ causa, and generally causae, after nihil, quid, are also found: non fuit causa, cur metueres; quid erat causae, cur metueret? ☞ also, sometimes est ut is used for est cur: ille erat ut odisset (= he had reason to hate) defensorem salutis meae (Cic., De Div., 1, 56): so non est igitur ut mirandum sit (Cic., Zumpt, § 562). My reason for doing anything was, that, etc., quod aliquid feci, eo pertinuit, quod, or, if a purpose is involved, ut: my reason for naming several, was, that, quod plures a nobis nominati sunt, eo peitinuit quod, etc. (Cic.). I have greater reason to congratulate than to entreat you, magis est, quod tibi gratuler, quam quod te rogem (comp. Krüger, § 615, A., 6, p. 838; Zumpt, § 562). I can give a reason for my belief, cur credam, afferre possum (Cic.). To find out some reason for anything, quaerere causam alicujus rei: causas confingere. To state anything to be the reason of, etc., praetexere aliquid. To state a reason for it, praetexere causam ad aliquid. For that reason, ea de causa: ob or propter eam causam. For more than one reason, aliquot de causis. For what reason? quam ob rem? qua de causa? Which (e.g., circumstance) is the reason that, etc., quod facit, ut, etc. (i. e., whence it happens that, etc.). For this reason..., that, idcirco... quod, or quoniam (idcirco... quia rare); ideo... quod or quia (not quoniam in the older writers. ☞ The clause with quod, etc., sometimes precedes when more emphasis is to be laid on the cause). If the “that” denotes a purpose, ideo or idcirco... ut or quo (ne or ut ne) are used. Was it for this reason..., that, etc., ? idcircone...? (in indignant questions). And for this reason, ideoque; et ideo; atque ideo (neque ideo = neque eo magis): ☞ not et igitur. (On all these particles, Vid: Rr. Introd., ii., 682 - 689.)

Argument, Vid:

Ratiocination, syllogismus (συλλογισμός, used as technical term of the modern logicians; but pure Latin is ratiocinatio or rationis conclusio).

Right, equity; e.g., with reason, jure: with full reason, justissime: with the best or according to all reason, optimo jure; merito atque optimo jure; jure meritoque; jure ac merito: merito ac jure: for what reason? quo jure? according to reason, ex aequo; sicut aequum est: it stands to reason, aequum, verum (Vid :, Liv., 3, 49, fin.), par, jus, fas est with infinitive, or accusative and infinitive (Vid: Grotef., § 236, 5, 6; Zumpt, § 600 and 623). By reason of; Vid: “on ACCOUNT of.”

To employ the faculty of reason in order to come to a conclusion, ratiocinari.

To discourse by way of reasoning, agere rem and de aliqua re (general term, to treat on any subject; Vid: Ochsn., Cic., Ecl., p. 230): disputare: disserere de aliqua re (to hold a dissertation on a subject, especially by way of discussion; Vid: Cic., Ecl., p. 12, and 354): sermonem habere de aliqua re (to have or to hold a conversation; of two or several persons); also, sermo est de aliqua re (Vid: Ochsn., Cic., Ecl., p. 401). [Vid: also, To DISCOURSE.]

To debate, consider, ponderare (to weigh anything over in one’s mind): reputare (to reckon over, as it were, in one’s mind the probable result of anything, generally with secum, or animo, or cum animo): scrutari: perscrutari (to dive into any subject, to find, by way of reasoning, the truth of it). Vid: To CONSIDER.