Extended Strong's Greek Lexicon (Abbott-Smith based)
custom
Usage: συνήθεια, -ας, ἡ (ἦθος), [in LXX: 4Ma.2:12 4Mac 6:13 4Mac 13:22 4Mac 13:27 * ;] __1 1 intimacy. __2. habit, custom: Jhn.18:39, 1Co.11:16; with genitive obj. (cf. Æschin., 23, 37, and see MM, xxiv), habitual use, force of habit with respect to, 1Co.8:7.† (AS)