ἀναγκαῖος
Etym. ἀνάγκη
"with or by force":
I. act. "constraining, applying force", Il.; ἦμαρ ἀν. the day "of constraint", i. e. "slavery", Ib.;so, ἀναγκαία τύχη the lot "of slavery", or "a violent death", Soph.; τῶι τῆς ἀρχῆς ἀναγκαίωι by "the compulsory nature" of our rule, Thuc.; ἐξ ἀναγκαίου under "compulsion", id=Thuc.
2. of arguments, "forcible, cogent", id=Thuc.
II. pass. "constrained, forced", πολεμισταὶ ἀν. soldiers "perforce", whether they will or no, Od.
2. "necessary", ἀναγκαῖόν [ἐστι], like ἀνάγκη ἐστί, c. inf., "it is necessary" to do a thing, Hdt., etc.; but, ἔνιαι τῶν ἀποκρίσεων ἀναγκαῖαι ποιεῖσθαι "necessarily requiring" to be made, Plat.
3. τὰ ἀναγκαῖα "necessary things, needs", as food, sleep, id=Plat., Xen.; τὰ ἐκ θεοῦ ἀν. the "appointed order of things, laws of nature", id=Xen.
4. "absolutely necessary, indispensable, barely sufficient"; ἀν. τροφή ῀ ἡ καθ᾽ ἡμέραν, Thuc.; τὸ ἀναγκαιότατον ὕψος "the least" height "that was absolutely necessary", id=Thuc.; ἡ ἀναγκαιοτάτη πόλις "the least that could be called" a city, Plat.
5. of persons, "connected by necessary ties", i. e. "related by blood", id=Plat., etc.:— οἱ ἀναγκαῖοι, Lat. necessarii, kinsfolk, Xen., etc.
III. adv. -ως, "necessarily, of necessity, perforce", ἀναγκαίως ἔχει it "must" be so, Hdt.; ἀν. φέρειν to bear "as best one can", opp. to ἀνδρείως, Thuc.
2. ἀν. λέγειν "only so far as is necessary", Plat.