Abbott-Smith Manual Greek Lexicon
συν-ίημι (G4920)
25 συν-ίημι and συνίω (v. Bl., § 23, 7), [in LXX chiefly for בּין hi., שׂכל hi. ;] to bring or set together . Metaph., to perceive, understand : Mt 13:13-15 (LXX) , 19 15:10 , Mk 4:9 (WH, mg.) , 12 7:14 8:17 , 21 Lk 8:10 , Ac 7:25 28:26, 27 , Ro 15:21 (LXX) , II Co 10:12 ; c. acc. rei, Mt 13:23 , 51 , Lk 2:50 18:34 24:45 ; seq. ὅτι , Mt 16:12 17:13 ; seq. quæst. indir., Eph 5:17 ; ἐπὶ τ. ἄρτοις , Mk 6:52 ; as subst., συνίων ( ὁ σ. , WH, mg.), a man of understanding , i.e. in moral and religious sense, Ro 3:11 (LXX) .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain