A.rapid motion forwards, onrush, onset, assault, “μόγις δέ μευ ἔκφυγεν ὁρμήν” Il.9.355; ἐκ τοῦ αὐτοῦ χωρίου ἡ ὁ. ἔσται the attack, invasion, Hdt.1.11 ; “ἡ ἐπὶ βασιλέα ὁ.” X.An.3.1.10 ; also of an impulse received from another, “ἐμέ τ᾽ εἰσορόων καὶ ἐμὴν ποτιδέγμενος ὁ.” Il.10.123, cf. Od.2.403.
2. more freq. of things, πυρὸς ὁ. the rage of fire, Il.11.157 ; ὑπὸ κύματος ὁρμῆς by the shock of a wave, Od.5.320 ; “ἔγχεος ὁ.” Hes.Sc.365; but ἐς ὁρμὴν ἔγχεος ἐλθεῖν within my spear's cast, within reach of my spear, Il.5.118 ; ὁ. γονάτων spring of knee, i.e. power to spring or leap, Pi.N.5.20 ; ποδὸς ὁ. speed of foot, E.El.112 (lyr.) : pl., of the tides, Ptol.Tetr.3.
II. impulse to do a thing, effort, “μίνυνθα δέ οἱ γένεθ᾽ ὁρμή” Il.4.466 ; “μελέη δέ μοι ἔσσεται ὁ.” Od.5.416 ; “φιλότητος . . ἄμβροτος ὁ.” Emp.35.13 ; “πίστιος ὁ.” Id.114.3 ; “ἐπεὶ δὲ δαιμονίη τις γίνεται ὁ.” Hdt.7.18 ; “μαινομένᾳ σὺν ὁρμᾷ” S.Ant.135 (lyr.), cf. Tr.720 ; τίς προσήγαγε χρεία; τίς ὁ.; Id.Ph.237; οὕτω καθ᾽ ὁρμὴν δρῶσιν, i. e. with so much zeal, ib.566 ; “εἰ . . ἄγοι αὐτὸν ὁ. θειοτέρα” Pl.Phdr.279a : joined with ἐπιθυμία, Id.Phlb.35d, Th.3.36 ; μιᾷ ὁ. with one impulse, X.An.3.2.9 ; “ἀπὸ μιᾶς ὁ.” Th.7.71 ; “ὑπὸ μιᾷ τῇ ὁ.” Luc.Hist.Conscr. 2 : c. gen. objecti, eager desire of or for a thing, Th.7.43, etc.: so with a Prep., “ἡ ὁρμή, ἣν ὁρμᾷς ἐπὶ τοὺς λόγους” Pl.Prm.135d, cf. 130b ; “ἔχειν ὁρμὴν πρός τι” Arist.MM1185a31, al. ; ὁ. ἐπέπεσέ τισι, c. inf., Th.4.4 ; ὁ. παραστῆσαί τισι εἴς τι or c. inf., Plb.2.48.5, Plu.Cor.33 ; ὁ. σχεῖν, c. inf., Id.Publ.19.
2. in Stoic philosophy, appetition, including reasoned choice and irrational impulse, Stoic.3.40, al.
3. Pythag. name for 2, Anatolius ap. Theol.Ar. 8.
III. setting oneself in motion, start on a march, etc., ἐν ὁρμῇ εἶναι to be on the point of starting, X.An. 2.1.3, cf. Arist.Rh. 1393a3 ; ἐπὶ παντὸς ὁρμῇ . . πράγματος at the start of every undertaking, Pl.Ti.27c ; ἡ ὁ. [τούτων τῶν ἀνέμων] the point at which these winds start, Arist.Mete.364b5, cf. Pl.R.511b (pl.). (Cf. Skt. s´rati 'flow'.)
