εὐτον-ία,ἡ,
A. tension, vigour, D.S. 5.39 ;σκελῶνib. 34 : esp. in Stoic philos. (cf.τόνος), Chrysipp.Stoic. 2.146 , etc.;ὁ ἐν τῇ ψυχῇ τόνος λέγεται ὡς εὐ. καὶ ἀτονίαib. 3.123 , cf. Phld. Ir. p.69 W.;εὐ. ψυχῆς, of courage, Stoic. 3.66 , cf. 73 : generally,vigourof character, Plu. Phoc. 3 , 2.456f , BGU 786ii 1
(ii A.D.); also,vigourof style, D.H. Vett.Cens. 2.3 , Hermog. Id. 1.11 , Aps. p.282 H.
b. Medic.,tension, Ruf. Sat.Gon. 46 (pl.); alsoμαλθακὴ εὐ. gentleforce, Hp. Ep. 15 .
c. elasticity, Ph. Bel. 71.33 .