Proto-Rathmosian/Later Developments

Common Changes

• unstressed eC > iC and eyC > iyC
• word-final, short a, e lost in words of 3 or more syllables: negara > negar
• loss of word-final nasals -n, -m with nasalisation or preceding vowel, creating new ą, ę, į, ų, ɚ and ąą, ęę, įį, ųų
• loss of word-final -t
• raising of e > i, ew > iw and ey > iy before i or y in the next syllable
• loss of y between vowels and contraction of remaining vowels
• loss of word-final short, non-nasal vowels in words of 3 or more syllables: negani > negan
• raising of a(a) > ä(ä), u(u) > ü(ü) before i, y in the following syllable
• lowering of u(u) > new vowel o(o) before a(a), ä(ä), ą(ą) in the next syllable: kukad "he eats" > kokad.
• unstressed diphthongs become long vowels: aw > oo, ay > ee, ew > oo, ey > ee
• final-syllable long vowels shortened

Pr-Rs	Stressed	Unstressed	Word-Final	i-mutated	-n/-m
a	a	a / -	ä	ą
e	e	i	e / -	i	į
i	i	i / -		į
u	u	u / -	ü	ų
o (bef. a)
ə	ə			ę
aa	aa	a	ää	ą
ee	ee	e	ii	ę
ii	ii	i		į
uu	uu	u	üü	ų
oo	o
aw	aw	oo	o	äw	-ǫ
ew	ew	öö	e	iw	-ę
iw	iw	üü	i	iw	-į
uw	uw	uu	u	üw	-ų
ay	ay	ää	e	äy	-ę
ey	ey	ee	e	iy	-ę
iy	iy	ii	i		-į
uy	uy	üü	i	uy	-ų

The changes described above resulted in the following vowel inventory for the late common period:

	Front	Central	Back
-Round	+Round	-Round	+Round
Close	i /i/ ii /iː/ į /ĩ/	ü /y/ üü /yː/		u /u/ uu /uː/ ų /ũ/
Mid	e /e/ ee /eː/ ę /ẽ/	ö /ø/ öö /øː/	ə /ə/	o /o/ oo /oː/ ǫ /õ/
Open	ä /æ/ ää /æː/		a /a/ aa /aː/ ą /ã/

Rathmos Changes

• ə(ə) > e(e), ɚ > a
• nasals followed by fricatives are lost, leading to compensatory lengthening and nasalisation of preceding vowel: negans > negąąs
• Cy > CC, except ry
• g > /ɣ/ in most positions, except ng, gg
• p, t, k > f, þ, h and b, d > v, ð before n, m, l, r
• a(a) and ay raised to ä(ä), äy except before -n, -m or before a back vowel (a(a), o(o), u(u)) in the next syllable
  • unstressed äC > eC
• word-final -a lost
• nasal vowels merge with non-nasal counterparts
• stressed ä, e, i > äw, ew, iw before -w, -lC, rC
• changes to diphthongs: ay > ae, aw > ao, äy > äe, äw > äo, ey > ee, ew > eo, uy
• k, g, sk palatalised to ch /t͡ʃ/, ȝ /ʝ/, sh /ʃ/ (a) before a front vowel (ä, e, i, ü) or y, or (b) after e, i except when followed by a back vowel: negara > neger > neȝer but neganta > negan
• i-mutation: a(a) > ä(ä), e(e) > i(i), o(o) > ö(ö), u(u) > ü(ü) before i, y in next syllable
• word-final -i, -u lost, except after light monosyllable
• unstressed vowel reduction:
  • medial syllable: a, ä, e lost, i, u lost after heavy syllable, > e after light syllable, oo > o, other long vowels > short
  • final syllable: ä, i > e, uC > oC, oo > u, other long vowels > short

Carrick Changes

• ə(ə), ɚ > a
• nasal vowels merge with non-nasal counterparts
• i-mutation: a(a) > ä(ä), o(o) > ö(ö), u(u) > ü(ü) before i, y in next syllable
• stressed e(e) > ja(a), except after l, w
• u-mutation: a(a) > o(o), ja(a) > jo(o), ä(ä) > œ(œ), e(e) > ö(ö), i(i) > ü(ü)
• y lost before front vowels and w before back vowels, except a
• devoicing of word-final consonants
• mp, nk, nt > pp, kk, tt

Summary of Vowel Changes

Change	kupakuren "smell" (loc.pl.)	feyhilep "fighter" (dat.sg.)	gawuya "feast" (gen.sg.)	reykitset "he loves you"	pupurad "it glistened"
unstressed e > i	kupakurin	feyhilip	gawuya	reykitsit
wf. -a, -e lost			gawuy
wf. -n, -m lost	kupakurį
wf. -t lost				reykitsi
i-mutation of e		fiyhilip		riykitsi
intervocalic y lost
wf. oral short vowels lost				riykits
i-mutation of a, u	kupakürį
a-mutation of u	kopakürį
unstressed diphthongs > long vowels			gawüü
final-syllable long vowels > short vowels			gawi > gäwi