Finnish

Proto-Uralic to Finnish sound changes

A few general sources:

• Lauri Hakulinen: Suomen kielen rakenne ja kehitys • Otava 1979 / Helsingin yliopisto 2000
• Petri Kallio: Kantasuomen konsonanttihistoriaa · Mémoires de la Société Finno-Ougrienne 253 · 2007
• Juha Janhunen: The primary laryngeal in Uralic and beyond · (same)

More stuff linked inline.

Technotes

• Here, /@/ is NOT an ASCIIfication of /ə/, but any vowel that assimilates to the preceding vowel. This comes useful with cases of compensatory lengthening and echo vowels.
• Similarly, /A O U/ are harmonic vowels which will assimilate to either /a o u/ or /æ ø y/ depending on the harmony. /a/ is to be understood as [ɑ].
• /ˣ/ is the assimilatory final, pronounced as lengthening of the next word's initial consonant, or in case of null initial, [ʔː] or hiatus. Very rarely, it occurs within words, too (usually sandwiched between two instances of the same vowel.)
• /C/ represents any consonant; /V/ represents any vowel; and /X/ represents any 2nd mora in a syllable (be it consonantal, diphthongal or chronemical).

I've grouped similar changes together under sub-headings, so the order of unrelated changes might not be exactly chronological whenever no reference was available. Also, since the document is headed towards Standard Finnish, I've had to cut a few corners anyway when maneuvering around dialectal changes... in a few cases picking the most represented outcome wasn't all that clear.

Proto-Uralic to Pre-Finnic

[Supposedly 4000 BCE to 3000 BCE]

The existence of "Proto-Finno-Samic" ("-Volgaic", "-Permic", "-Ugric") as distinct from PU is unclear, hence "Pre-Finnic". Changes shared with Samic are in indigo, those also shared with Mordvinic in green, and those with even wider distribution in orange.

Word-final */ŋ/ → k in the lative ending (Samic and?), → n elsewhere (!dubious, pre-Uralic?)

Monophthongization (dubious)

• iw → y / _C (distribution?)
• potentially: ow → uː / _C (kuusi 'Abies')

Introduction of length from loss of preconsonantal *x (may have been [ə]).

• x → @ / _C (huosi- kieli kuole- kuusi 'Abies' nuole- nuoli suomu tuomi tuuli. Samoyedic confirmation of *x unavailable for kuori kuule- liemi mieli pieni piere- puoli sieni uudin vieri vuoli vuori, contradictory for niele- suoni. Possibly also in koi voi. Possibly a separate development in the numerals viisi kuusi.)

Alternately, coda *x may not have existed at all; most of the concerned words can be explained via a change A → Aː / _Ri (ie. before an anterior resonant in close-vowel stems). Exception: pane- [1] The origin of long close vowels uu ii is not securely founded, outside of syllable contractions (see below).

koi voi also seem to derive from *ka(x)ji wa(x)ji (no lengthening/raising occurs in *täji → täi however).

Coda nasal simplification

• m → n / _{t tsʲ #} (Finnic, Mordvinic; medially also Permic, Mansi)

Stressed vowels — unconditional changes

• ë(ː) → *a(ː)
• aː æː → oː eː (but postdates unconditional stressed non-high vowel lengthening in Samic. Exception: ääni, possibly due to initial position)

Stressed vowels — conditional changes?

• #je → #ji (ilma ~ OU *jeeləm, jüvä ~ IE *jeva)

Unstressed vowels

• a → æ / {æ e ê i ü}(X)(C)C_ (if not an original distinction; vowel harmony fails only in Samic and Permic)
• Aw → o (the presence of -w rarely is shared, so this may also be analogical)
• i → e / _C (but part of a general i → ɤ shift in Samic)
• iw → u (apparent in nomina verbum; not shared, but probably contemporary with *Aw → o)

Pre-Finnic to Proto-Finnic

[Ca. 3000 BC to 2000 BC] (likely also incomplete; this is the section of changes not shared by other branches of Uralic)

Vowel changes

• V# → Vː (affects most old CV words, eg. muu nuo tuo. Exceptions me te he se ne, the first two of which display -k in Livonian, -t in Far Northern dialects.)
• *ê *ô → e o / _(X)Ci (new hypothetical vowels for PU, possibly semi-rounded [ɪ ʊ])
          → y ɯ → y i / _(X)CA
• ej → i / unstress'd
• æ → e / _j unstress'd
• a → e / {o u}[+STR](X)C_j
     → o / {a e i}[+STR](X)C_j
     → a / elsewhere

(Other instances of unstressed /aj/, eg. in plurals of derivativs, shift too, but analogical leveling has render'd it impossible to tell whether the original result was /ej/ or /oj/.)

Loss of *x, *ŋ & medial *w. These may have merged in some ways. Medial cases:

*x	*ŋ	*w
(N/A)	UŋA → Oː (myö-tä; but syyhy ~ S. *sëŋē )	UwA → Oː (hyö-tä- vuo) (cf. retention variants hyvä uv-e)
uxi → oː (juoda, unless this is *ë or *ô, puo)	Uŋi → Uː (kuu pyy uu-ttu; but ŋ → w in suvi tyvi)	Uwi → Uː (luu puu suu tyyni) (cf. retention variant tyven)
exi → øː/eː? (myö-; vie-?)	eŋi → øː (pyörä)	ewi → øː (lyö- syö- työ, first may also be *-x-)
ixi → iː/eː? (siili; vie-?)	iŋi → iː, (hiiri pii 'tooth' riihi sii 'beam' vii-me)	(no change: kivi)
Axi → Aː (jää- maa saa- sää "filament" sääri ääri)	Aŋi → Aː (jää kaari pää sää 'weather')	(no change in savi; *äwi → äw in käy-)
oxi → oː (tuo-)	oŋi → oː (luo luoda ; but ŋ → w in povi)	(no change: ovi; lovi is ← Gmc)
possibly → w (arvo ← II argʰa)	ŋ → w / _{U O}, elsewhere _A (pivo vävy, avaa- kevät)	(no change: kevyt kova nivo- etc.)

• suo may be an irregular development from PU *toxi, or related to Samic *sōńë ~ *sōŋë (← *soNi?)
• syy may have had any of x w j; dial. syvi probably favors *süwi
• Possibly in newer formations, x → w / {U O}_C (souta- nouta-), → j / {I E}_C (keima-). Potentially, viisi kuusi belong here too (with -x- retained before an obstruent?)
• ŋ remains / _k
     possibly → n / _t (ensi, unless *e-nti-; onte-)
     → j / _Cʲ (seiso- veitsi, puna-ise-) (or is it F_ ?)
     → w / _C (jauha- jousi joutsen), C_ (aivo ahven pilvi sauva)

Loss of medial *j in i-stems (retention elsewhere, sija etc.)

• wI → i (medial unstressed new /i/!)
• ji → @ / {i e ü}_ (kiehu- pii "Si" tie; kyy?)
     → j / {A o u}_ (koi soi- tai- täi uida voi, ?? koira, unless simply consonant-stem *koj-ra)
     → i / C_{# C) (järin neli- nurin veli vihi väli, perhaps rähise- ärise-; väri ~ värjää- is straight from Sw.)
• /yje/ → */øː/ → yö

Dissimilation

• uw ij → ow ej / _C (souta- keima- again; perhaps jousi nouta- if not *ô)

Initial deaffrication. Newer initial affricates are found in loanwords and onomatopoeia. (Should this go further back?)

• ʧ ʦʲ → ʃ sʲ / #_

Depalatalization, commonly attributed to Germanic superstratum influence.

• ʦʲ(ː) sʲ ðʲ lʲ → ʦ(ː) s ð l (may be older for *ðʲ)
• nʲ → ni / #(C)i_V (i.e. after a short stressed /i/; miniä)
     → in / V_V (some other cases: kyynel kyynärä paina-, oinas??)
     → n (elsewhere)

CCC simplification

• ntt → tt (kattaa tuta) (or just *mtt?)
• wst → st / o_ ? (nouse- → nosta-)
• Common also in loanword adaptation since an early date.
  • Late PIE *arktos →→ F/Mo *okti "bear"
  • Gmc ntj nkj → tj kj (examples TBA)

From around here, isoglosses within Finnic start appearing.

Loss of *ð and *ʧ

• ð → t (may be gradation-related, shared with Mordvinic but not Samic. Put here to avoid requiring postulating intermediate *tʲ for the development of *ðʲ)
• ʧ ʧː → t tʃ (In South Estonian, *ʧ → ts / _k)
• Possibly in pre-Livonian: *tk → *kk before this (*kutki *kütke-j-mä → kukki kikiim, but eg. *piðka → pitka, *počka → potka).
• Cf. also *kočka → F. kotka ~ kokko; NF latki- ~ SF lakki-)

Assibilation, fed by all three previous changes

• t → ʦ / _i
• tj → ʦ

except after a coronal obstruent (the clusters /tt st ʃt/) or before a derivational suffix

Esh-drift

• ʃ → ʂ → x (postdates old Baltic and Germanic loanwords; as well as the previous on account of blocking assibilation. Per Permic, the retroflex stage may date back quite far)
• s → x / _l (pihlaja. Cf. the late str → sr → F. hr)

Nasal simplification part 2. Note old Germanic loans feeding -ntj-! Probably postdates the previous, given no simplification in *nx (vanha inho etc.)

• n → ∅ / _(t)s (asia rasia nisä osa otsa kusi) (distribution?)

Paradigmatically reverted in cases of *-ntsi ~ *-nte- such as kansi, ponsi; not however in ordinals: kolmas ~ kolmante- (also note Est. kaas vel. sim. - a later reprise per compensatory lengthening? - and Liv. vuontsa - suggesting Gmc. loan origin?)

• ln → lː (alla halla pellava yllä, -llA -lle if clitickized yet)

Results as:

Phonology of late Proto-Finnic

Consonant inventory

	Lab.	Dnt.	Alv.	Vel.
Nasals	m		n
Stops & affricate	p	t	ʦ	k
Fricatives			s	x
Lateral			l
Rhotic			r
Semivowels	v		j

(I'm marking *w → [ʋ] as /v/ from now on, for brevity. The change is practically impossible to date.)

Syllable structure (C)V(@, i, U, C)(C). Coda /p/ only occurred morpheme-internally.

/#ji #je #vu/ did not occur.

Allowed medial clusters included the following (and possibly more, depending on how many consonantal root forms were in existence yet by this stage):

• /pː pt pʦ tː tk ʦː kː kt kʦ/ (/ʦk/?)
• /mp nt nʦ ŋk/
• /nx/
• /ps ks/ (/kst/?) and perhaps /tx kx(t)/ (if not simplified to /x(t)/ yet; check!)
• /tn km/ (only intermorphemically)
• /sm st sn sl sk xm xt xn xl xr xk/
• all liquid + non-liquid combinations other than /ln/
• Vj + any consonant
• VU + /p t ʦ k s h m (n l?) v/
• /ntː ŋkː rtː rkː lkː/?
• various CC combinations preceded by Vj, VU or V@

VU + /j r/ are forbidden and metathesize to /jv rv/ in loans (haiven häivä laiva raiva- raivo, järvi karva tarvas torvi; kaivata with analogous gradation?). At an older stage, this included VU + /s x v/ → /sv (hv?) @v/ (kasva- rasva, haava kaava naava), but this was disrupted by the development *ŋ → U (jousi jauha- sauva). (Cf. J. Koivulehto: Suomen laiva-sanasta, Pinta ja rasva)

Note also kauha ~ kahva, kiuru ~ kirvinen, kuilu ~ kulju, pälvi ~ S. *pēvlë.

While several later common innovations affect both South Estonian and the remainder of Finnic, pre-Finnic *č is reconstructable in some cases per the former (*kačke- *kačku *kičke- *nočko *pučki *sičkajn)

Vowel inventory
/i iː y yː      u uː /
/e eː   øː      o oː /
/æ æː      a aː      /
/ej ew          oj ow/
/æj æw    aj aw uj   /

/aː æː/ were rare, originally only occuring in about half a dozen roots each. (These new instances are of fuzzy origin, apparently loanwords acquired after the change to */oː eː/?)

/i e A o (u?)/ could occur in non-initial root syllables (plus /ej oj/ due to suffixal j).

Proto-Finnic to Proto-Finnish

[Ca. 2000 BCE to 1000 CE]

Difthong paradigm shift j w → i U / V_{C #} (not really phonetical; required for pre-diphthongal consonants not to gradate) - wait, but they do gradate in some dialects; needs bumping, then

Consonantal suffix and stem-forms

• i → ∅ / VC_, ks_ suffix-finally
• e → ∅ / stem-finally after a coronal

(This change could be much older and is actually more complex, but I don't know what's the latest understanding)

Consonant gradation. These all occur on the general condition that the folloing syllable is closed.

• pː tː tsː kː → pˑ tˑ tsˑ kˑ / {sonorant}_V (the half-long stage can still itself trigger gradation; no gradation is found in Veps or Livonian)
• p t ts s k → b d s z ɡ / {sonorant}_V

(NB: gradation of modern /ht hk/ is analogy-borne)

Suffixal gradation (needs elaboration)

• p t s k → b d z ɡ / V[-STR]_V

Spirantization

• b d ɡ → β ð ɣ / except N_ (may be later - not evident in Veps. Votic β ð ɣ → v ∅ g is probably a Russicism)
  • ɣ → j~v / V[-STR]_V (jalava kajava kataja etc.)
  • βi → U / _# (3PS -Pi)

Around this time there's also a paradigm shift wrt. /f/ in loanwords: the reflex of initial /f/ changes from /p/ to /v/. This could signify a change of [w] to [ʋ] in the position, but also of [ɸ] to [f] in the loaning languages (or even the onset of Grimm's law)! Medial /f/ does not seem to ever turn to /p/.

Loss of /v/ before labial vowels

• v → ∅ / #_{o u y} (perhaps also: non-initially? kärventää ~ käry, kalvaa ~ kaluta — but late in *hehvo → hieho, maybe laiho ~ Vo laivo)

The consonant may have persisted before long vowels, but since a glide was epenthetically added there anyway (see next), there's no way to tell. Compensatory lengthening may have occurred before *u (*wuðʲi → uusi). Shared with Samic, Mordvinic & Mari, but note that this seems to be a late areal change — it is later than the South Finnic change from *o to *ɤ per *wo-tta- "to take" → *vɤtta- → Es. võtma- (however, note the counterexample *wolka → õlg).

Loss of */j/ before /i/ is likely of similar age, but Samic seems inconsistent (due to ē → jē / #_ ? cf. also no medial loss: *velji → veli, ~ *vēljɤ)

V-epenthesis

• ∅ → v / #_oː (at least vuo vuohi vuona vuosi vuota; possibly vuole- vuori if *v-loss was originally complete)

Notable exception: 'uoma. Before *øː, treatment is inconsistent: vyö "belt", but yö "night" — homonym avoidance? Per *voohla → vohla "goat kid" (*voohi → vuohi "goat") this would seem to be the later of the two changes involving initial *v.

Vowel shifts

• oi → o / [-STR] (but reverted back in many, though not all, cases where the -i was morphological)
• Vː → V / _i (Clearly postdates epenthesis: voi ← *vooji. Also imperfects (myi söi toi etc.), obliq plurals (maita puita teitä etc.); keittää (cf. kiehua); possibly nai- (cf. naaras))
• a → aː / _rn (aarni haarniska kaarna kaarne saarna saarni vaarna (check dating!))

Assimilation of many consonant clusters to geminates, etc. (Dating provisional for most, perhaps older.) All of these require a morpheme boundary somewhere in the cluster. A basically equivalent criterion is requiring a preceding unstressed syllable. Of these, /rn pt kt kx tx/ (/kʃ tʃ/?) occurred root-medially, and the first three were retained (though rn → rː may have occurred in aarre; cf. aarni - and kt → tː is required for tytär, which appears to be the only loan with the cluster around this timeframe. Võro has even root-medially pt kt → tː.)

• kt(s) pt(s) → tː(s)
• xk → kː (happens also across word boundaries, precluding the formation of /?/)
• (t)(ː)sn → sː
• kx (tx) → xː
• rn → rː
• pn tn kn ktn ptn (etc.) → nː (note esp. linna ~ Võ liin, Vo lidna; but vuonna ~ Vo voona, vuona ~ Vo võdna)
• pm tm km (etc.) → mː
• pst tst kst → st
• ks nʦ nt → s s t / _# (jänis etc, kolmas etc, tuhat)

(The consequent obscuring of many inflected forms due to this and the previous change, esp. the essiv, however eventually caused many words to revert back, commonly with vowel insertion. Eg. *sut-na, *laps-na → sunna lassa → sutena lapsena. Note also *pekstä, *pekse- → piestä, piekse-)

Fricativ collapse, part 3

• ʦ → s
• ʦˑ/ː → θˑ/ː (remains gradational; etsi- itse joutsen katso- kitsas lietso- loitsi- kutsu- metsä ratsu otsa paatsama vatsa veitsi virtsa vitsa)
• z → h
• x(ː) → h (a spirantic pronunciation can still be found in coda position)

Shifts involving /h/ (unfinished)

• e → @ / h_ in suffixes
• p k → h / _t (With IE loanwords continuing to feed new /pt kt/, this rule remained active up until to the 20th century.)

Proto-Finnish to Standard Finnish

[Ca. 1000-1900 CE] These changes are, for the most part, only attested in the Finnish-Karelian continuum.

ö-harmony

• ä → a / eC_C*o (elanto emakko erakko eranto kesakko kesanto venakko; ? epatto), eC_C*u (sepalus)
• o → ö / {y ä ö}X*_ (analogically generalized to certain suffixes even in i/e-words, eg. heittiö, ',)

"Flavor": Voiced prenasal stops become geminate nasals, and (around the same time as in a whole lot of other European languages!) long mid vowels become opening diphthongs. Also, the weak grade of geminates coincides with the strong grade of singletons:

• mb nd ŋg → mː nː ŋː
• eː øː oː → ie yø uo (could be older; Estonian has uo → oo)
• pˑ tˑ kˑ θˑ → p t k θ

More shifts with /h/

• Vh → hV / {j v n r l}_# (aihe vaihe sauhu venhe unho parha- erhe perhe orhi murhe urho alhainen ylhäinen valhe; löyhä? dialectally regular)
  • dubbelmetathesis: imeh → *imhe → ihme
  • speaking of metathesis, also sn → ns (känsä runsas)
• V → Vː / h_hC in haahka haahti hieho (← *hehvo) hiihtää huuhkaja huuhtoa (regular in Karelian)
  • also several other, irregular _hC cases
• k h → ˣ / _#
• t → ∅ / s_r (ahrain ihra kehrä ohra) (cf. next), then *sr → hr

Pre-sonorant stop vocalization (with an intermediate spirant stage)
Predominantly Germanic loanwords; a few Baltic, and (not necessarily too reliable) Uralic etymologies exists for *kopra *kotva *kupla *nakris *syklä. By the evidence of other Finnic languages, would-be *tl in loanwords is substituted by *kl (eg. *seeθla → *seekla).

• p → U / _S (hauras kauris koura seura taulu teuras vauras äyräs; also note kupla, from a conservativ dialect)
      →v / _j (kavio)
• t remains _{v, j} (katve ketju kotva latva lotja patja patvi vitja)
      → U / _r{A, O} (aura nöyrä peura puuro, possibly uuras)
      → @ / _r{i, e} (teeri; w/dialectal variants teiri, teyri, töyri; vetreä might be random metathesis from *verteä)
     
• k → @ / _j (laaja raaja taaja vaaja)[2]
      → i / {i, e}_S{i, e} (eilen keila leili leiri neilikka peili teili teini tiili; probably rather occurred in loaning Finland Swedish dialects, except eilen, of unkno'n origin & where Karelian explicitly retains /kl/; dialectal variants eylen öylen. Also note kekri from a conservativ dialect, variants köyri etc.)
      → U / {A, O, U}_S (S≠j) (hauli kaula kaura käyrä kyyry myyrä mäyrä naula nauris naura- paula vaula väylä sauna syylä taula uuni vaunu; note vuokra, from a conservativ dialect); {i e}_Sa (neula seula siula siuna-)

Changes involving /j/

• j → i / C_ suffix-initially (including cases where the plain root isn't found: asia kavio etc.)

Spirant loss

• β → v
  • v → ∅ / _UC (aulis auttaa haukka hius keuhko kiukku kiusa köykäinen liueta liukas liukua reuhtoa riuska soukka säyseä tyyssija, possibly aukko loukko saukko)
• ið → j / V[-STR]_V
• ð remains V[+STR](X)_
      → l / l_
      → r / r_
      → ∅ / elsewhere
• ɣ → j / C_e
      → v / U_U
      → ? / V1V2_V2 (including the cases of V1=V2; also V2≠U)
      → ∅ / elsewhere
• h → ∅ / V[-STR](X)_V

Subsequent vowel changes in unstressed syllables (unfinished, may need to be meshed with the prev. section)

• AO → Aː, Oː or Uː (seemingly irregularly)
• Ae → Ai
• Ue → eː
• VU → Vː / _#
• iU → Uː
• OU → Oː (kokoontu-; but aitous etc.)

Initial-syllable labialization

• ey → øy (exception: leyhyä. The regular variant löyhyä also exists)
• i → y | _C*y (in non-productiv forms; at least lytty pysty pysy-, possibly pylly; vieri- → vyöry- may be contamination with pyörä)
• i → y / _væ (jyvä hyvä syvä) (this one is actually older than the others, but fits here better; predates ji > i!)

The final stages of interdental loss began after or around the time of the creation of the literary language, seen in spellings such as <tz dh>. By standardization it was however practically complete. The standard outcome is largely a spelling pronunciation based on the example of German and Swedish:

• θ(ː) → ts
  • Exceptions: → tː in mittumaari; → ht in vihta
  • Related hypercorrection ht → ts: otso
• ð → d (commonly alveolar)
  • Exceptions: → ∅ in auer kahareisin kohentaa lähettää muuan navetta rehennellä rehellinen tuho yhyttää; → l in railo talikko

Most common dialectal variations for the former are t(ː) and ht~t, for the latter r and ∅.

Modern Standard Finnish

Modern Standard Finnish has the following consonant phonemes:

p t    k (ʔ)
b d    ɡ
m n    ŋ
f s (ʃ) h
ʋ l r j

/b ɡ f ʃ/ only occur in loanwords and neologisms. /ʃ/ is rather marginal and usually replaced by /s/. [ʔ] occurs optionally word-initially before a vowel, and between two identical vowels.

The vowels are /i e æ ø y ɑ o u/. Vowel harmony continues to apply to suffixes, however in loanwords and neologisms /æ ø y/ and /ɑ o u/ can co-occur (psyko-, hyla, sekundääri). Examples of /æ/ and /ɑ/ co-occurring remain rare; even the lexicalized compound tällainen is usually pronounced [ˈt̪ælːæ(i)ne̞]. All vowels may occur long at any position of the word; however, (C)VVCC syllables occur only in very recent loans (pointti).

Any difthongs that end in -i/-y/-u and adhere to vowel harmony and the Obligatory Contour Principle are possible, tho in stressed syllables /ey/ is exceedingly rare (due to the change to /øy/; found only in the verb leyhy-) and /iy/ nonexistant.

The following sound changes (mostly old ones!) are commonplace in spoken Standard Finnish:

• n → ∅ / _#
• d → ∅/r in inherited vocabulary
• Va → Vː / unstress'd
• ie yö uo → ii yy uu / _A
• ne le → @ / CVCV verb stems (mee paa oo tuu)

Proto-Finnic to Livonian

(OR)

Palatalization 1 (everywhere except in ?Votic, Finnish proper, some Estonian & Karelian dialects; possibly needs splitting)

• t ts s(C) n l r → tʲ tsʲ sʲ(C) nʲ lʲ rʲ / _i

Deaffrication (near universal in Finnic, but note the exception here)

• ts⁽ʲ⁾ → s⁽ʲ⁾ / except n_ (vuontsa)

Common South Finnic changes (Estonian, Võro, Votic)

• e → ɤ / _C(C){a o u}
• ä → a / [-STR] (phonemicizes the prev. - also in Veps. Not evident in Võro, but might be a later reintroduction of harmony)
• h → ∅ / {# C}_ (initially only dialectally in Estonian)
• Vn → Vː / _s (in Livonian only in new loans *kansa, *pensas; in E/Võ/Vo also from *nts, see prev.)

Umlaut

• a ä → ä e / _C*i

Vowel reduction

• V → ə / [-STR] ≠a (*u *i survive in certain suffixes, but never in roots)
• a → ə / [-STR] VC(C)aC(C)_#, also always in verbal stems

Early length

• Vh → Vːɦ / _C (except hj hv?)

Liquid metathesis

• LV → VL / [-sonorant]_ (*atra → *atar, *putro → *putor, etc.) (may need relocation)

Voicing

• p t⁽ʲ⁾ k s⁽ʲ⁾ → b d⁽ʲ⁾ g z⁽ʲ⁾ / when not initial or next to another voiceless segment (yes, final consonants voice too!)

Early glottalization

• (C)VCV → (C)VʔCV

Apocope

• ə → ∅ / _#, VC_CV

Gemination etc.

• C → Cː / ʔ_V
• gj dj lj rj → jg dʲ lʲː rʲː
• dv zv lv rv jv → d z lː rː jː
• Cv → C / elsewh.

Length II / degemination

• VCːa → VːCa / [+sonorant] (preceeds general presonorant lengthening since *a → ō, *o → ūo from here)
• Cː → C / except V_ə in verbs (unless this is a reflex of the infinitiv!?)

Vowel shift 1

• aː au → ɔː ɔu (some new *aː develop in words like *parma → _paarm_ "gadfly")
• eː (øː) oː → iːe (yːø) uːo
• ɤ(ː) → ɨ(ː)

2nd glottalization

• ɦ → ʔ

Sibilants (hard to date)

• (t)sʲ (d)zʲ → (t)ʃ (d)ʒ

Vowel shift 2

• y ø → i e
  • except äy ey → äu eu (may be original)
• V → Vː / _[+sonorant]C(C)a (including diphthongs in -i, eg. *aitta → āita)
• a → aː / VC_
• e o → eː oː / _Ca
• o → oː / _[+sonorant]C#, _i
• eː oː → je wo (= <ie uo>, UPA /ⁱe ᵘo/)
  • wo → vo / #_
  • wo → ʊ / [+bilabial]_
• ɔ(ː) → o(ː) (or just ill-transcribed?)

Notes for other Finnic languages

• cf. Kettunen: Viron kielen äännehistoria, Vatjan kielen äännehistoria, SUST 252: Suomen lähisukukielten luonteenomaisimmat piirteet

• All except Liv.: ks → s / _#
• All except Savonian Finnish ~ Karelian: Vː → V / _h (old per no apocope: eg. Est. rohi, Veps roho)
• Veps ~ Ludic ~ Karelian: ts(ː) → ʧ(ː)
  • Karelian proper: s → ʃ except / i_ (WTF? A 2nd round of depalatalization?), str → tr
  • Ludic & Veps: medial voicing, str → sr → zr
    • Veps proper: final voicing, degemination, s → ʃ / i_, palatalization / _i (viž kuź!), ä ü → a u / [-STR], iu eu → üu öu, loss of vowel length, l → u / V_C, dialectally: ei → iː, j → dʲ / #_
• Estonian & Veps: trimoraic apocope
• Estonian & Votic: o → ɤ / _(C*){i e}, _u, Vː → V / _h, h → ∅ / {n r l}_, loss of ð ɣ, *ee *oo remain (relower'd?)
  • Estonian: jh wh → hj hv / V_, Vi → Ve / _{r v}, akj akR → ai aeR, V → ∅ / VXC_#, high V → mid V / _nonhigh V, ü → i [-STR] (→ u in 3rd+ syllables, or anharmonic all along)
  • Votic: e → ɤ / [-STR] when back-vocalic, k → ʧ / _V[+front], kj → ɟɟ, h → ∅ / #_, st → sː (→ s if grad.), NP → P / V[-STR]_, k p → h / _s (cf. the similar common change _t), s → h / _ʧ, ʧ → s / #ʧVh_

This article is one of quite a few pages about Natlangs. Indo-european natlangs: Balto-Slavic Natlangs: Czech * Russian Celtic Natlangs: Revived Middle Cornish * Pictish Germanic Natlangs: North Germanic Natlangs: Norwegian West Germanic Natlangs: Anglo-Saxon * Dutch * English (Old English * Middle English * Modern English * Scots) * German (High German * Low German) Indo-Iranian Natlangs: Pahlavi Italic Natlangs: French * Italian * Latin * Spanish Debated: Cimmerian Uralic Natlangs: Finnish * Khanty * Mansi * Mordvinic * Proto-Uralic Altaic (controversial): Japanese Sino-Tibetan Natlangs: Uto-Aztecan Natlangs: Nahuatl - Isolate Natlangs: Basque * * Hypothetical/debated Natlangs and Natlang families: Danubian * Europic (obsolete)