necessary (adj.) Copy link Outline I. Indispensably requisite1. nĕcessārius2. nĕcessĕ, indecl. (with esse and habere)3. ŏpus, indecl. (need, needfulII. Inevitable • necessary (adj.): I. Indispensably requisite: 1. nĕcessārius: everything n. to life, omnia quae ad vitam n. sunt, Cic. Off. 1, 4, init. 2. nĕcessĕ, indecl. (with esse and habere): buy not what you want, but what is n., emas non quod opus est, sed quod n. est, Cato in Sen. Ep. 94, 28: I do not deem it n. to write ..., (non) habeo n. scribere, Cic. Att. 10, 1, extr.: necesse est is also (less freq.) foll. by subj., Zumpt L. G. § 625: cf. Sall. Jug. 31, ad init., necesse est suomet ipsi more praecipites eant, i. e. all that is n. is that, etc. 3. ŏpus, indecl. (need, needful: either with abl. of thing needed; or as indecl. predicate, the thing needed being nom.): before you begin, deliberation is n., prius quam incipias, consulto opus est, Sall. Cat. 1, extr.: v. needful. II. Inevitable: nĕcessārius: if the first link in the chain (of cause and effect) is n., it follows ..., si, quod primum in connexo est, n. est, sequitur, etc., Cic. Fat. 7, 14, et pass.: a n. conclusion, n. conclusio, id. Top. 16, 60. Or expr. by necesse: v. necessarily.
necessary (subs.) Copy link • necessary (subs.): expr. by nĕcessārius: the n.s of life, quae ad vivendum sunt necessaria, Cic. Off. 1, 4, init.: may also be expr. by, quae natura desiderat; (omnia) quae ad victum cultumque pertinent, Cic. Off. 1, 44, 158; quod ad usum vitae pertinet, ib. 3, 5, 22. Phr.: by this means the army was abundantly supplied with all n.s, quae res omnium rerum copia complevit exercitum, Caes. B. C. 2, 25, extr.: (barely) to obtain the n.s of life by manual labour, manuum mercede inopiam tolerare, Sall. Cat. 37: v. livelihood.
NECESSARY Copy link • NECESSARY 1. (With a substantive), necessarius: a necessary thing, necessitas, res necessaria. (Without a substantive) it is necessary, opus est (there is need of: ☞ the person who has need of a thing is in the dative; the thing needed in the nominative or ablative; also, with an infinitive, which is then the casus subjecti; the genitive occurs twice in Livy, 22, 51; 23, 21, and sometimes, but very rarely, in the poets; Vid: Ramsh., §142; Zumpt, §464; Krebs, §392; Wyttenb., §255, 314, 324): necesse est; necessarium est, oportet [Vid: MUST]: usus est (☞ almost only in the poets; once in Livy, rarely in Caes., ; Vid: Ramsh., § 142, 2, n. 3; Zumpt, §464, 2; Herzog, ad Caes., B.G., 4, 2): also by attinet; e.g., it is not necessary to say, nihil attinet dicere: it is not necessary that you should wait, nihil opus est, exspectare te (Cic.): it is not necessary, nihil est, non est quod (☞ not non opus est quod): to consider necessary, necesse habere: I thought it necessary to do, etc., hoc faciendum putavi: not to find anything necessary, supersedere posse aliqua re; or with an infinitive; e.g., loqui apud vos supersedissem (Liv.). ☞ Avoid the Grecism, opus habere; which occurs only once, Col., 9, 1, 5. 2. s. res necessaria: necessitas: necessaries, res quibus homines utuntur; res quibus carere non possumus; ea quae natura desiderat: necessaries of life, res ad vitam necessariae; usus vitae necessarii: quae sunt ad vivendum necessaria; quae ad victum cultumque pertinent.