Lexical Definition

‎ἔννομος‎ énnomos (en'-nom-os) under law G:A / G:ADV
from ‎ἐν‎ and ‎νόμος‎

lawful, under law.

Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
ἔννομοσ under law 1Cor.9.21
ἐννόμῳ lawful Acts.19.39

Abbott-Smith

** ἔν-νομος, -ον [in LXX: Si, prol. 12* ;]
1. lawful, legal (MM, Exp., xiii): Ac 19:39.
2. Of persons,
(a) law-abiding;
(b) under law: ἔ. Χριστοῦ, in relation to Christ, I Co 9:21 (Cremer. 435).†

Abbott-Smith References

Book Refs
Acts 19:39
1 Corinthians 9:21

Liddell-Scott-Jones

ἔννομος, ον,

ordained by law, lawful, legal, [Refs 5th c.BC+]; [χθονὸς αἶσα] [Refs 5th c.BC+]; ἔννομα πείσονται they will suffer lawful punishment, [Refs 5th c.BC+]; . ὁμολογία, πολιτεία, [Refs 5th c.BC+]; ἐκκλησία [NT]; ἡλικία, χρόνοι, [Refs 2nd c.BC+] adverb -μως, ζημιοῦσθαι, διοικεῖσθαι,[Refs 5th c.BC+]: comparative -ώτερον[Refs 3rd c.AD+]

__2 of persons, keeping within the law, upright, just, [Refs 5th c.BC+]; also, subject to the law, μὴ ὢν ἄνομος Θεοῦ, ἀλλ᾽ . Χριστοῦ [NT]
__II (νέμομαι) feeding in, i.e. inhabiting, οἳ γᾶς τότ᾽ ἦσαν ἔννομοι [Refs 4th c.BC+]

LSJ Scripture Refs: Acts.19.391Cor.9.21