Abbott-Smith Manual Greek Lexicon
κεφάλαιος (G2774)
2 κεφάλαιος , -α, -ον ( κεφαλή ), [in LXX ( -αιον, τό ) for רֹאשׁ , Nu 4:2 , al.;] of the head ; metaph., principal , chief ; mostly as subst., κεφάλαιον, τό ; the chief point : He 8:1 . the sum total , amount : Ac 22:28 (other meaning, LS, s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain