Abbott-Smith Manual Greek Lexicon
συνήθεια (G4914)
3 ** συνήθεια , -ας, ἡ ( ἦθος ), [in LXX: IV Mac 2:12 6:13 13:22 , 27 * ;] intimacy . habit, custom : Jo 18:39 , I Co 11:16 ; c. gen. obj. (cf. Æschin., 23, 37, and v. MM, xxiv), habitual use, force of habit with respect to, I Co 8:7 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain