ἀγών-ισμα · agōn-isma — LSJ
contest, conflict: in pl., deeds done in battle, brave deeds, Hdt. 8.76; feats of horsemanship, X. Eq.Mag. 3.5; ἀ. κατὰ τὰ ἆθλα CIG 2741.
in sg., feat, achievement, ἀ. τινος a feather in his cap, Th. 8.12, cf. 17: c. inf., Id. 7.59, 86; ξυνέσεως ἀ. prize of sagacity, Id. 3.82; ἀρᾶς ἀ. issue of the curse, E. Ph. 1355.
ἀ. ποιεῖσθαί τι make it an object to strive for, Hdt. 1.140; οὐ μικρὸν τὸ ἀ. προστάττεις Luc. Im. 12.
that with which one contends, declamation, ἀ. ἐς τὸ παραχρῆμα Th. 1.22; of plays, Arist. Po. 1451b37.
in Law, plea, Antipho 5.36, Lys. 13.77.