Abbott-Smith Manual Greek Lexicon
ἐξ-αγοράζω (G1805)
4 † ἐξ-αγοράζω [in LXX: καιρόν ὑμεῖς ἐξαγοράζετε ( זְבַן ), Da LXX TH 2:8 * ;] to redeem, ransom (esp. of slaves): metaph., Ga 3:13 4:5 . to buy up ; mid., to buy up for oneself : τ. καιρόν , Eph 5:16 , Col 4:5 (Cremer, 60).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain