-ον

Etymology 1
From Proto-Hellenic *-on, from. Cognate with Latin neuter -um (from Old Latin and Proto-Italic *-om) both in names and adjectives.

Etymology 2
From.

Etymology
See.

Suffix

 * 1)  ending for nominative, accusative and vocative singular forms (e.g. μέλλον).
 * 2) For Katharevousa endings, see