From *rьvьnь (“zeal”) + *-ostь.
*rьvьnostь f
singular | dual | plural | |
---|---|---|---|
nominative | *rьvьnostь | *rьvьnosti | *rьvьnosti |
genitive | *rьvьnosti | *rьvьnostьju, *rьvьnosťu* | *rьvьnostьjь, *rьvьnosti* |
dative | *rьvьnosti | *rьvьnostьma | *rьvьnostьmъ |
accusative | *rьvьnostь | *rьvьnosti | *rьvьnosti |
instrumental | *rьvьnostьjǫ, *rьvьnosťǫ* | *rьvьnostьma | *rьvьnostьmi |
locative | *rьvьnosti | *rьvьnostьju, *rьvьnosťu* | *rьvьnostьxъ |
vocative | *rьvьnosti | *rьvьnosti | *rьvьnosti |
* The second form occurs in languages that contract early across /j/ (e.g. Czech), while the first form occurs in languages that do not (e.g. Russian).