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nĕcesse (arch. nĕcessum ,
I.v. infra: NECESVS, S. C. de Bacch. l. 4: necessus , Ter. Heaut. 2, 3, 119 Wagn. ad loc.; id. Eun. 5, 5, 28; Gell. 16, 8, 1; v. Lachm. ad Lucr. 6, 815), neutr. adj. (gen. necessis, Lucr. 6, 815 ex conj. Lachm.; cf. Munro ad loc.; elsewhere only nom. and acc. sing., and with esse or habere) [perh. Sanscr. naç, obtain; Gr. root ἐνεκ-; cf. ἀνάγκη; v. Georg Curtius Gr. Etym. 424].
I. Form necesse.
A. Unavoidable, inevitable, indispensable, necessary (class.; cf.: opus, usus est)
1. With esse.
a. With subject.-clause: “edocet quanto detrimento...necesse sit constare victoriam,Caes. B. G. 7, 19: “necesse est eam, quae ... timere permultos,Auct. Her. 4, 16, 23: emas, non quod opus est, sed quod necesse est, Cato ap. Sen. Ep. 94, 28: “nihil fit, quod necesse non fuerit,Cic. Fat. 9, 17: “necesse est igitur legem haberi in rebus optimis,id. Leg. 2, 5, 12; id. Verr 2, 3, 29, § 70. —
b. With dat. (of the person, emphatic): nihil necesse est mihi de me ipso dicere, Cic. Sen. 9, 30: “de homine enim dicitur, cui necesse est mori,id. Fat. 9, 17.—
B. Needful, requisite, indispensable, necessary: “id quod tibi necesse minime fuit, facetus esse voluisti,Cic. Sull. 7, 22.—
II. Form necessum (mostly ante-class.).
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