Quick Definition
I convince, give assurance to
Strong's Definition
to assure
Derivation: from G4103 (πιστός);
KJV Usage: assure of
Thayer's Greek Lexicon
πιστόω, πιστῷ: 1 aorist passive ἐπιστωθην; (πιστός);
1. to make faithful, render trustworthy: τό ῤῆμα, 1Ki_1:36; τινα ὅρκοις, Thucydides 4, 88; universally, to make firm, establish, 1Ch_17:14.
2. Passive (the Sept. in various senses for πΖΰΑξΘο) and middle to be firmly persuaded of; to be assured of: τί (Opp. cyn. 3, 355. 417; Lucian, philops. 5), 2Ti_3:14; Hesychius ἐπιστώθη. ἐπείσθη, ἐπληροφορήθη. (In various other senses in secular authors from Homer down.)
Mounce Concise Greek Dictionary
πιστόω pistoō 1x
to make trustworthy; pass. to be assured, feel sure belief, 2Ti_3:14
Abbott-Smith Greek Lexicon
πιστόω , -ῶ
( < πιστός ),
[in LXX chiefly for H543 ni .;]
to make trustworthy ( Thuc ., 1Ki_1:36 ), hence, to establish ( 1Ch_17:14 ). Pass . and mid ., to be assured of: c . acc rei , 2Ti_3:14 .†
Moulton & Milligan — Vocabulary of the Greek NT
πιστόω [page 515]
πιστόω occurs in the pass. in the sense am assured of in 2Ti_3:14 : cf. 3Ma_4:20 and the v.l. in 2Th_1:10 (cf. WH Notes .2 , p. 128). For the mid. see Syll .3 633 .77 ( c. B.C. 180) εἶναι αὐτοὺς ἀτελεῖς πιστωσαμένους ὅρκωι , διότι ἐπὶ κτήσει ποιοῦνται τὴν διαγωγή [ν . A good ex. of the NT use of the verb is afforded by Aristeas 91 πεπεισμένος δὲ καὶ αὐτὸς τὴν τῶν ὑποδοχείων κατασκευὴν δηλώσω , καθὼς ἐπιστώθην , such is my belief as to the nature of the reservoirs, and I will explain how it was confirmed (Thackeray). We may note the late compd. πιστοφορέω (not in LS 8 ) : P Lond IV. 1338 .10 (A.D. 709) πιστοφορέθητι εἰς τοῦτο , be sure of that. For the rare subst. πίστωμα , see Linde Epic. p. 16 f.
Liddell-Scott — Intermediate Greek Lexicon
πιστόω πιστόω, [Etym: πιστός] "to make trustworthy", πιστοῦν τινα ὅρκοις "to bind" him "by oaths", Thuc. Pass. "to be made trustworthy, give a pledge or warrant", ὅρκῳ πιστωθῆναί τινι "to bind oneself" to another by oath, Od. "to feel trust or confidence", i. e. "to trust, to be persuaded", πιστωθῆναι ἐνὶ θυμῷ id=Od. ; πιστωθεὶς ὅτι . . , "feeling confidence" that . . , Soph. Mid. "to give mutual pledges of fidelity, exchange troth", χεῖράς τ᾽ ἀλλήλων λαβέτην καὶ πιστώσαντο Il. :— πιστοῦσθαί τινα ὑφ᾽ ὅρκου "to secure" his "good faith" by oaths, Soph. "to confirm, prove, make good, guarantee", τι Polyb. , Luc.
STEPBible — Tyndale Abridged Greek Lexicon
πιστόω, -ῶ
(πιστός), [in LXX chiefly for אָמֵן ni. ;]
to make trustworthy (Thuc., 3Ki.1:36), hence, to establish (1Ch.17:14). Pass. and mid., to be assured of: with accusative of thing(s), 2Ti.3:14.†
(AS)