αὐτογνώμων

ον, ονος, Adv., ἡ
A. on one's own judgement, at one's own discretion, κρίνειν αὐ., opp. κατὰ γράμματα, Arist. Pol. 1270b29, cf. 1272a39. Adv. ‐όνως Plu. Demetr. 6: —hence Subst. αὐτο‐οσύνη, ἡ, Zonar.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project