nouns: · a-stems · va-stems · ja-stems · ia-stems · ô-stems · vô-stems · jô-stems · iô-stems · i-stems · u-stems · an-stems · ôn-stems · în-stems · nd-stems · root nouns · r-stems ·
The ia-stems are a subgroup of the a-stems, just like ja- and wa-stems, but since the endings of the ia-stems don't really look like the a-stem endings anymore, they are treated separately. There are quite a few masculine ia-stems in OIcel., but not that many in OSw. The neutral ones are very common in both the west and the east, though.
If the stem ends with a /g/ or a /k/, a /j/ is inserted between it and all endings that begin with /a/ or /u/.
The neutral ia-stems only differ in the nominative and accusative.
The ia-stems have their origin in proto-indo-european jo-stems, just like the ja-stems, but the suffix -jo- developed differently depending on whether the preceeding syllable was long (i-e. jo > germ. ia (or ija)) or short (i-e. jo > germ. ja).
sing: nom: -iaR < -iaz < -jos ; gen: -ias < -jas/-jes < -joso/-jeso ; dat: -iê < -iai < loc. -joi ; acc: -ia < -ian < -jom
plur: nom: -iôR < -iõz < -jõs (-jo+es) ; gen: -ia < -iô < -iõn < -jõm (-jo+om) ; dat: -iumR < -iomiz < -jomes ; acc: -ian < -ians < -jons
The neutral endings: sing: nom/acc: -ia < -ian < -jom
plur: nom/acc: -iu < -iô < -jô (-jo+H)
© Peter Pettersson