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Concept
Gemination
Summary
In phonetics and phonology, gemination (ˌdʒɛmᵻˈneɪʃən), or consonant lengthening (from Latin geminatio 'doubling', itself from gemini 'twins'), is an articulation of a consonant for a longer period of time than that of a singleton consonant. It is distinct from stress. Gemination is represented in many writing systems by a doubled letter and is often perceived as a doubling of the consonant. Some phonological theories use 'doubling' as a synonym for gemination, while others describe two distinct phenomena.
Consonant length is a distinctive feature in certain languages, such as Arabic, Berber, Danish, Estonian, Finnish, Hindi, Hungarian, Italian, Japanese, Kannada, Malayalam, Punjabi, Polish and Turkish. Other languages, such as English, do not have word-internal phonemic consonant geminates.
Consonant gemination and vowel length are independent in languages like Arabic, Japanese, Finnish and Estonian; however, in languages like Italian, Norwegian and Swedish, vowel length and consonant length are interdependent. For example, in Norwegian and Swedish, a geminated consonant is always preceded by a short vowel, while an ungeminated consonant is preceded by a long vowel. A clear example are the Norwegian words tak tɑːk ('ceiling or roof' of a building), and takk tɑkː ('thanks').
Lengthened fricatives, nasals, laterals, approximants and trills are simply prolonged. In lengthened stops, the obstruction of the airway is prolonged, which delays release, and the "hold" is lengthened.
In terms of consonant duration, Berber and Finnish are reported to have a 3-to-1 ratio, compared with around 2-to-1 (or lower) in Japanese, Italian, and Turkish.
Gemination of consonants is distinctive in some languages and then is subject to various phonological constraints that depend on the language.
In some languages, like Italian, Swedish, Faroese, Icelandic, and Luganda, consonant length and vowel length depend on each other. A short vowel within a stressed syllable almost always precedes a long consonant or a consonant cluster, and a long vowel must be followed by a short consonant.
Official source
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