Abbott-Smith Manual Greek Lexicon
αὐτόματος (G844)
2 αὐτόματος , -ον , and -η, -ον (etym. doubtful; v. Boisacq, Prellwitz, s.v.), [in LXX, Le 25:5 , 11 , IV Ki 19:29 ( סָפִיחַ ), Jos 6:5 , Jb 24:24 , Wi 17:6 *;] of persons, acting of one's own will . Of inanimate things and natural agencies, of itself , of its own accord : γῆ , Mk 4:28 (MM, s.v.); πύλη , Ac 12:10 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain