-η

Etymology
From earlier, from Proto-Hellenic *-ā, from. The earlier -ᾱ is retained in certain dialects, and in Attic after ε, ι or ρ, whence -εā, -ιā and -ρā (e.g., ἀγορά agorā).

Cognate with Latin feminine -a, from Old Latin and Proto-Italic *-ā both in names and adjectives, e.g., φυγή (phugḗ, "retreat, escape") < Proto-Hellenic *pʰugā́ < Proto-Indo-European *bʰugéh₂; at the same time, *bʰugéh₂ > Proto-Italic *fugā (preserved in Old Latin) > Classical Latin fuga.

Usage notes
In Attic, the suffix retains the form after,  or.

The o-grade and zero-grade derivations have the accent on the suffix.