Compensatory lengthening
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| Historical sound change |
|---|
| General |
| Metathesis |
| Dissimilation |
| Fortition |
| Lenition (weakening) |
| Sonorization (voicing) |
| Spirantization (assibilation) |
| Rhotacism |
| Debuccalization (loss of place) |
| Elision (loss) |
| Apheresis (initial) |
| Syncope (medial) |
| Apocope (final) |
| Haplology (similar syllables) |
| Fusion |
| Cluster reduction |
| Compensatory lengthening |
| Epenthesis (addition) |
| Anaptyxis (vowel) |
| Excrescence (consonant) |
| Prosthesis (initial) |
| Paragoge (final) |
| Unpacking |
| Vowel breaking |
| Assimilation |
| Coarticulation |
| Palatalization (before front vowels) |
| Labialization (before rounded vowels) |
| Final devoicing (before silence) |
| Vowel harmony |
| Consonant harmony |
| Cheshirisation (trace remains) |
| Nasalization |
| Tonogenesis |
| Floating tone |
| Sandhi (boundary change) |
| Crasis (contraction) |
| Liaison, linking R |
| Consonant mutation |
| Tone sandhi |
| Hiatus |
Compensatory lengthening in phonology and historical linguistics is the lengthening of a vowel sound that happens upon the loss of a following consonant, usually in the syllable coda. This may be considered an extreme form of fusion.
An example from the history of English is the lengthening of vowels that happened when the voiceless palatal fricative /ç/ and its allophone [x] were lost. For example, in Chaucer's time the word night was pronounced /niçt/; later the /ç/ was lost, but the /i/ was lengthened to /iː/ to compensate. (Later the /iː/ became /aɪ/ by the Great Vowel Shift.)
Both the Germanic spirant law and the Ingvaeonic nasal spirant law show vowel lengthening compensating for the loss of a nasal.
Non-rhotic forms of English have a lengthened vowel before a historical post-vocalic */r/: in Scottish English, girl has a short /i/ followed by a light alveolar /r/, as presumably it did in Middle English; in Southern British English, the */r/ has dropped out of the spoken form and the vowel has become a "long schwa".
Compensatory lengthening may also occur with consonant cluster reduction. For example, in Italian Victoria has become Vittoria [vitːoria].
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