Abbott-Smith Manual Greek Lexicon
κἄν (G2579)
17 κἄν , by crasis for καὶ ἄν (= ἐάν ; WH, App. , 145 b ; Thayer, s.v.), c. subjunc., and if : Mk 16:[18] , Lk 12:38 , Jo 8:55 , I Co 13:2 , 3 , Ja 5:15 ; c. ellips., Lk 13:9 . Concessive, even if : Mt 21:21 26:35 , Jo 8:14 10:38 11:25 , He 12:20 . As intensive of simple καί (M, Pr. , 167; WM, 730; Jannaris, Gr. , 598), even , at least : Mk 5:28 6:56 , Ac 5:15 , II Co 11:16 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain