στηριγμόςstērigmós, stay-rig-mos'; from G4741; stability (figuratively):—stedfastness.
Thayer's Greek Lexicon
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STRONGS G4740:
στηριγμός, στηριγμοῦ, ὁ (στηρίζω), firm condition, steadfastness: of mind, 2 Peter 3:17. (of a standing still, Diodorus 1, 81; Plutarch, mor., p. 76 d.)