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αὐτό-μᾰτος, η, ον, Hom. and Att.; ος, ον Hes.Op.103, Arist.GA 762a9, Philetaer. 1 D., Hp.EP19 in Hermes 53.65.

1. of persons, acting of one's own will, of oneself, αὐ. δέ οἱ ἦλθε Il.2.408; αὐ. φοιτῶσι Νοῦσοι Hes.Op.103; αὐ. ἥκω Ar.Pl.1190, cf. Th.6.91, D.S.2.25, etc.

2. of inanimate things, self-acting, spontaneous, of the gates of Olympus, αὐτόμαται δὲ πύλαι μύκον οὐρανοῦ Il.5.749; of the tripods of Hephaistos, which ran of themselves, ὄφρα οἱ αὐτόματοι ..δυσαίατ' ἀγῶνα 18.376, cf. Pl.Com.188; ὅπλα ..αὐ. φανῆναι ἔξω προκείμενα τοῦ νηοῦ Hdt.8.37; τὰ αὐ. marionettes, Arist.GA734b10, Hero Aut. passim: generally, spontaneous, βίος Pl.Plt.271e; ἔπαινος Epicur. Sent.Vat.64.

3. of natural agencies, ὁ ποταμὸς αὐ. ἐπελθών of itself, Hdt.2.14; of plants, growing of themselves, αὐ. ἐκ τῆς γῆς γίνεται Id.3.100; αὐ. φύεσθαι Id.2.94, Thphr.Fr.171.11; κύτισος αὐ. ἔρχεται Cratin.98.8: metaph., αὐτόματα πάντ' ἀγαθὰ ..ποριζεται Ar. Ach.976, cf. Cratin.160; of philosophers, αὐ. ἀναφύονται Pl.Tht. 180c.

4. of events, happening of themselves, without external agency, αὐ. δεσμὰ διελύθη E.Ba.447; αὐ. θάνατος natural death, D. 18.205; κόποι αὐ. not to be accounted for externally, Hp.Aph.2.5; ἀπό τινος αἰτίας αὐτομάτης Pl.Sph.265c; without visible cause, accidental, opp. ἀπὸ πείρης, Hdt.7.9.γ́.

II. αὐτόματον, τό, accident, τὸ αὐ. αἰτιᾶσθαι Lys.6.25; σε ταὐ. ἀποσέσωκε Men.Epit.568; διὰ τὸ αὐ. Arist.Ph.195b33; τὸ αὐ. ἀγαπῶντες Id.Ath.8.5; τῷ αὐ., opp. τέχνῃ, Id.Metaph.1070a7: most freq. in the form ἀπὸ τοῦ αὐτομάτου or ἀπὸ ταὐτομάτου, ἀποθανέειν ἀπὸ τοῦ αὐ. Hdt.2.66, cf. Th.2.77, Pl. Ap.38c, al., Arist.Po.1452a5, al., Men.Pk.31; ἐκ τοῦ αὐ. X.An.1.3.13; τὸ Αὐ. personified, Ath.Mitt.35.458 (Pergam.); ταὐτόματόν ἐστιν ὡς ἔοικέ που θεός Men.291.

III. Adv. -τως, = ἀπὸ ταὐτομάτου, v.l. in Hdt.2.180, Hp.Fract.43, Arist.PA640a27, al., Theoc.21.27; of itself, κοχλίας αὐ. βαδίζων Plb.12.13.11:—
also αὐτοματεί or -τί (q.v.).