Lexical Definition

‎πιστόω‎ pistóō (pis-to'-o) be convinced G:V
from ‎πιστός‎

assure of.

Usage: 7 forms in 12 verses
Form Translated As     In Verse(s)
ἐπιστώθησ you were assured of 2Tim.3.14
πιστώσαι confirm LXX.1Kgs.1.36
πιστωθήτω be trusted LXX.1Chr.17.24
be trustworthy LXX.2Chr.1.9
let be trustworthy LXX.2Chr.6.17
let it be trusted LXX.1Chr.17.23
trustworthy LXX.1Kgs.8.26
πιστωθήσεται shall be trustworthy LXX.2Sam.7.16
πίστωσον confirm as trustworthy LXX.2Sam.7.25
επιστώθησαν are trustworthy LXX.Ps.93.5
did they trust LXX.Ps.78.37
επιστώθη trustworthy LXX.Ps.78.8

Abbott-Smith

πιστόω, -ῶ (< πιστός), [in LXX chiefly for אמן ni.;]
to make trustworthy (Thuc., III Ki 1:36), hence, to establish (I Ch 17:14). Pass. and mid., to be assured of: c. acc. rei, II Ti 3:14.†

Abbott-Smith References

Book Refs
1 Kings 1:36
1 Chronicles 17:14
2 Timothy 3:14

Liddell-Scott-Jones

πιστόω,

make trustworthy, πιστοῦν τινα ὅρκοις bind him by oaths, [Refs 5th c.BC+]

__II passive, to be made trustworthy, give a pledge or warrant, πιστωθείς [Refs 5th c.BC+]; μοι.. ὅρκῳ πιστωθῆναι ἀπήμονά μ᾽ οἴκαδ᾽ ἀπάξειν bind yourselves to me by oath.., [Refs 8th c.BC+]
__II.2 feel trust or confidence, to be persuaded, ὄφρα.. πιστωθῆτον ἐνὶ θυμῷ [Refs]; πιστωθεὶς ὅτι.. feeling confidence that.., [Refs 5th c.BC+]
__III middle, give mutual pledges of fidelity, exchange troth, χεῖράς τ᾽ ἀλλήλων λαβέτην καὶ πιστώσαντο [Refs 8th c.BC+]
__III.2 πιστοῦσθαί τινα ὑφ᾽ ὅρκου secure his good faith by oaths, [Refs 5th c.BC+]
__III.3 confirm, prove, τῷ παρόντι τοὐπιόν [Refs 5th c.BC+]; guarantee, τι [Refs 2nd c.BC+]; τι διότι.. [Refs 3rd c.BC+]; μάρτυρι τῷ Νέρωνι, ὅτι.. [Refs 2nd c.AD+]; τίς ἂν τάδε πιστώσαιτο,.. ὅτι..; [LXX+4th c.BC+]