ὄλβιος ὅστις ἱστορίης ἔσχεν μάθησιν → happy the man who has gained knowledge through inquiry (Εuripides, fr. 910)
adj.
To be seen: P. and V. θεατός. Clear, manifest: P. and V. σαφής, ἐμφανής, φανερός. Capable of being perceived by the senses (philosophical term): P. αἰσθητός (Plat.). Important enough to be noticed: use P. ἀξιόλογος.
