Extended Strong's Greek Lexicon (Abbott-Smith based)
confidence
Usage: πεποίθησις, -εως, ἡ (πείθω), [in LXX: 4Ki.18:19 (בִּטָּחוֹן)* ;] confidence: 2Co.1:15 3:4 10:2, Eph.3:12; before εἰς, 2Co.8:22; ἐν, Php.3:4 (the word is condemned by the Atticists, see Rutherford, NPhr., 355).† (AS)