-а-

• -о- (-o-) — stressed
• -е- (-je-) — used after some palatalized and hushing consonants

Inherited from Old Ruthenian -о- (-o-), from Old East Slavic -о- (-o-), from Proto-Slavic *-o-. Compare Russian and Ukrainian -о- (-o-).

-а- • (-a-)

1. interfix used to form compounds