Lexical Definition

‎ἀναγκαῖος‎ anankaîos (an-ang-kah'-yos) necessary ^G:A
from ‎ἀνάγκη‎

near, necessary, necessity, needful.

• necessary
• by implication, close (of kin)

Abbott-Smith

** ἀναγκαῖος, -αῖα, -αῖον (< ἀνάγκη), [in LXX: Es 8:13, Wi 16:3, Sir prol. 22, II Mac 4:23 9:21, IV Mac 1:2*;]
1. necessary: Ac 13:46, I Co 12:22, II Co 9:5, Phl 2:25, Tit 3:14, He 8:3; comp. -αιότερον, Phl 1:24.
2. Of persons connected by bonds of nature or friendship, near, intimate (Field, Notes, 118; ΜΜ, VGT, s.v.): ἀ. φίλοι, Ac 10:24.†

Abbott-Smith References

Liddell-Scott-Jones

ἀναγκαῖος-αῖος, α, ον,

in Attic dialect also ος, ον [Refs 5th c.BC+]: of, with, or by force:

__I active, constraining, applying force, μῦθος ἀ. a word of force, [Refs 8th c.BC+]; χρειὼ ἀ. urgent necessity, [Refs 8th c.BC+]; ἦμαρ ἀ. day of constraint, i.e. life of slavery, [Refs]; ἀ. τύχη a doom imposed by fate, or fateful chance, [Refs 5th c.BC+] (but, fatal chance, [Refs 6th c.BC+]; τῆς ἀρχῆς τῷ ἀ. παροξυνομένους by the compulsory nature of our rule, [Refs 5th c.BC+]; ἐξ ἀναγκαῖοςαίου under stress of circumstances, [Refs 5th c.BC+]
__I.2 forcible, cogent, πειθώ[ἀναγκαῖοςαιοτέρους 5th c.BC: Thucydides Historicus 4.60">Refs 5th c.BC+]; τὰ-ότερα τῶν ἀντιγράφων the more authoritative copies, [Refs 5th c.BC+]
__II passive, constrained, forced, twice in [Refs 8th c.BC+] soldiers perforce, [Refs 8th c.BC+]; so δμῶες ἀ.[Refs] trusty, serviceable, see below [Refs]
__II.2 necessary (physically or morally), οὐκ ἀ. unnecessary (on its different senses in philosophy see [Refs 4th c.BC+] it is necessary to.., [Refs 5th c.BC+]; γίνεταί μοι ἀναγκαῖοςαιότατον, with infinitive, [Refs 5th c.BC+]; ἀ. κακόν a necessary evil, [Refs 4th c.BC+]: also with infinitive, ἔνιαι τῶν ἀποκρίσεων ἀναγκαῖοςαῖαι διὰ μακρῶν τοὺς λόγους ποιεῖσθαι[ἀναγκαῖοςαιοτάτην εἶναι τρέπεσθαι “Sph.” 242b">Refs 5th c.BC+]; [μαθήματα] ἀναγκαῖοςαῖα προμεμαθηκέναι necessary for us to have learnt them before, [Refs]
__II.3 τὰ ἀ. necessaries of life, [Refs 5th c.BC+]
__II.3.b τὰ ἀ. things necessary to be done, [Refs 5th c.BC+]; τὰ ἐκ θεοῦ ἀ. the appointed order of things, HG[ἀναγκαῖοςαῖον τόδε 5th c.BC: Euripides Tragicus “Hecuba” 584 codices: τὸ ἀ., ={ἀνάγκη}, 4th c.BC: Aristoteles Philosophus “Physica” 200a31. ">Refs 5th c.BC+]
__II.4 indispensable, i. e. a bare minimum, frequently in superlative, τὸ ἀναγκαῖοςαιότατον ὕψος the least height that was absolutely necessary, [Refs 5th c.BC+]; ἡ ἀναγκαῖοςαιοτάτη πόλις the least that could be called a city, [ἀναγκαῖοςαιοτάτων συγκεῖσθαι πόλιν 4th c.BC: Aristoteles Philosophus “Politica” 1291a12">Refs 5th c.BC+]; αὐτὰ τἀναγκαῖοςαιότατ᾽ εἰπεῖν give a bare outline of the facts, [Refs 4th c.BC+]; ἡ ἀ. συγγένεια the most distant degree of kinship recognized by law, [ἀναγκαῖοςαῖα ἐξικέσθαι 5th c.BC: Thucydides Historicus 1.70">Refs 5th c.BC+]: hence, scanty, makeshift, παρασκευή[Refs]
__II.5 of persons, connected by necessary or natural ties, i. e. related by blood, [Refs 5th c.BC+]kinsfolk, [NT+5th c.BC+]
__II.6 Astrology texts, efficacious, [Refs 2nd c.AD+] line of fate, [Refs]
__II.7 costly, ὄξος[Refs 5th c.AD+]; ἐσθής[Refs]
__III adverb -ως of necessity, perforce, ἀ. ἔχει it must be so, [Refs 5th c.BC+]; ἀ. φέρειν, opposed to ἀνδρείως, [Refs 5th c.BC+]; as best might be, [Refs 5th c.BC+]
__III.2 γελοίως καὶ ἀ. λέγειν in a narrow sense (compare [Refs 2nd c.AD+]:—superlative ἀναγκαῖοςαιότατα, λέγεις[Refs 5th c.BC+]
__III.3 strictly, κελεύειν[Refs 1st c.AD+]
__IV οἱ ἀ. τόποι privy parts, [Refs 2nd c.AD+]
__V see {ἀναγκαῖοςαῖον}, τό

_{LSJ Scripture Refs: Acts.10.24}