Lexical Definition

‎πεποίθησις‎ pepoíthēsis (pep-oy'-thay-sis) confidence G:N-F
from the perfect of the alternate of ‎πάσχω‎

confidence, trust.

Usage: 3 forms in 7 verses
Form Translated As     In Verse(s)
πεποιθήσει by confidence 2Cor.8.22
confidence 2Cor.1.15 • 2Cor.10.2 • Eph.3.12
πεποίθησισ this reliance LXX.2Kgs.18.19
Πεποίθησιν Confidence 2Cor.3.4 • Phil.3.4

Abbott-Smith

† πεποίθησις, -εως, ἡ (< πείθω), [in LXX: IV Ki 18:19 (בִּטָּחוֹן)*;]
confidence: II Co 1:15 3:4 10:2, Eph 3:12; seq. εἰς, II Co 8:22; ἐν, Phl 3:4 (the word is condemned by the Atticists, v. Rutherford, NPhr., 355).†

Abbott-Smith References

Book Refs
2 Kings 18:19
2 Corinthians 1:15 · 3:4 · 8:22 · 10:2
Ephesians 3:12
Philippians 3:4

Liddell-Scott-Jones

πεποίθησις-ησις, εως, ἡ,

trust, confidence, boldness, [LXX+1st c.BC+]: in plural, [Refs 2nd c.AD+]

LSJ Scripture Refs: LXX.2Kgs.18.19 ☩ Eph.3.12