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Also, tonal contour may reinforce the length, as in Estonian, where the over-long length is concomitant with a tonal variation resembling tonal stress marking. In transcription in the International Phonetic Alphabet, long vowels or consonants are notated with the length sign (ː Unicode U+02D0 MODIFIER LETTER TRIANGULAR COLON) after the letter.
In linguistics, vowel length is the perceived length of a vowel sound: the corresponding physical measurement is duration.In some languages vowel length is an important phonemic factor, meaning vowel length can change the meaning of the word, for example in Arabic, Czech, Dravidian languages (such as Tamil), some Finno-Ugric languages (such as Finnish and Estonian), Japanese, Kyrgyz, Samoan ...
In most analyses, consonant length is seen as phonemic while vowel length is seen as determined entirely by environment, with long vowels occurring in stressed syllables before single consonants and before certain sequences formed of a consonant plus [v r j], and short vowels occurring elsewhere. Note that diphthongs also occur long and short.
Distinctive consonant length is usually restricted to certain consonants and environments. There are very few languages that have initial consonant length; among those that do are Pattani Malay, Chuukese, Moroccan Arabic, a few Romance languages such as Sicilian and Neapolitan, as well as many High Alemannic German dialects, such as that of ...
Monosyllabic nouns ending in a consonant receive an epenthetic final /e/. Cf. /ˈrem/ > /ˈren/ > /ˈrene/ > French rien. [30] Phonemic vowel length gradually collapses via the following changes (which only affect vowel length, not quality): [31] Long vowels shorten in unstressed syllables. Long vowels shorten in stressed closed syllables.
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, or of a vowel in an adjacent syllable. Lengthening triggered by consonant loss may be considered an extreme form of fusion (Crowley 1997:46).
However, because consonant length is no longer contrastive, doubled consonants are purely an orthographical device to indicate vowel length. Long vowels in closed syllables are doubled, and consonants are doubled following short vowels in open syllables even when it is not etymological.
The unstressed short vowels are about 40 ms in physical duration, the unstressed long vowels about 70 ms. The stress adds about 100 ms, giving short stressed as 130–150 ms and long stressed as 170–180 ms. The half-long vowel, which is always short unstressed, is distinctively longer than the standard 40 ms.