διά-γνωσις · dia-gnōsis — LSJ
distinguishing, means of distinguishing, discerning, diagnosis
distinguishing, τὴν δ. ποιεῖσθαι ὁποῖοι ἐκράτουν ἢ ἐκρατοῦντο Th. 1.50; means of distinguishing or discerning, E. Hipp. 926; καλῶν ἢ μὴ τοιούτων τίς δ.; D. 18.128; δ. φωνῆς καὶ σιγῆς Arist. Cael. 290b27; of medical diagnosis, δ. ποιεῖσθαι Hp. VC 10, Gal. 8.766, etc.
2 power of discernment
power of discernment, E. Hipp. 696.
II resolving, deciding, determine
resolving, deciding, δ. ποιεῖσθαι Antipho 6.18; περί τινος D. 18.7; ταχίστην ἔχει δ. Isoc. 1.34; τοῦ ὃ πρακτέον ἐστίν Metrod. Fr. 27; δ. τῆς ἀξίας ποιεῖσθαι to determine the value, Pl. Lg. 865c; = Lat. cognitio, Act. Ap. 25.21, BGU 19i20 (ii A. D.), 891r24 (ii A. D.); ἐπὶ διαγνώσεων τοῦ Σεβαστοῦ, = Lat. a cognitionibus Augusti, IG 14.1072, cf. Ephes. 3 No.51 (iii A. D.).