LSJ
Pass., to be ratified or confirmed before, ἐν τῷ κεκυρωμένῳ ψαφίσματι Supp.Epigr. 3.674A28 (Rhodes, ii BC); διαθήκη κεκυρωμένη ὑπὸ τοῦ ̣̣εοῦ Ep. Gal. 3.17; — Med., Anon. Prog. in Rh. 1.605 W.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
TBESG
προ-κυρόω, -ῶ
to establish or confirm beforehand: Gal.3:17.†
(AS)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars