φαιδρότης
From LSJ
τούτων γάρ ἑκάτερον κοινῷ ὀνόματι προσαγορεύεται ζῷον, καί ὁ λόγος δέ τῆς οὐσίας ὁ αὐτός → and these are univocally so named, inasmuch as not only the name, but also the definition, is the same in both cases (Aristotle, Categoriae 1a8-10)
English (LSJ)
ητος, ἡ,
A brightness, brilliance, ὀφθαλμῶν Poll.6.199; λίθων Lib.Or.11.89, cf. 221. 2 metaph., joyousness, Isoc.15.133, Plu.2.595d.
German (Pape)
[Seite 1250] ητος, ἡ, 1) Reinheit, Klarheit, Glanz. – 2) übertr., Heiterkeit, Fröhlichkeit, Isocr. 15, 133.