Abbott-Smith Manual Greek Lexicon
συν-εῖδον (G4894)
2 ** συν-εῖδον irreg. aor. of συνοράω (v.s. εἶδον ), [in LXX: I Mac 4:21 א , II Mac 2:24 4:4 , 41 R 5:17 7:4 , 20 8:8 , III Mac 2:8 A * ;] to see together or at the same time (Arist., Xen.). to see in one view , hence, of mental vision, to comprehend, understand (LXX, Polyb., Plut., al.) : Ac 12:12 14:6 (on the related σύνοιδα , v. s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain