Related to the adjectival suffixes *-jaz, *-ijaz. Cognate with Proto-Slavic *-ьje, Latin -ium, Ancient Greek -ιον (-ion). This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.
*-(i)ją n
(For more information on the following alternation see Sievers's law).
Following a short stem, which consists of a short vowel followed by a single consonant:
neuter ja-stemDeclension of *-ją (neuter ja-stem) | |||
---|---|---|---|
singular | plural | ||
nominative | *-ją | *-jō | |
vocative | *-ją | *-jō | |
accusative | *-ją | *-jō | |
genitive | *-jas, *-is | *-jǫ̂ | |
dative | *-jai | *-jamaz | |
instrumental | *-jō | *-jamiz |
Following a long stem, which has either a long vowel or diphthong, or a short vowel followed by several consonants:
neuter ja-stemDeclension of *-iją (neuter ja-stem) | |||
---|---|---|---|
singular | plural | ||
nominative | *-iją | *-ijō | |
vocative | *-iją | *-ijō | |
accusative | *-iją | *-ijō | |
genitive | *-ijas, *-īs | *-ijǫ̂ | |
dative | *-ijai | *-ijamaz | |
instrumental | *-ijō | *-ijamiz |