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In phonetics, gemination or consonant elongation happens when a spoken consonant is pronounced for an audibly longer period of time than a short consonant. Gemination is distinct from stress and may appear independently of it. Gemination literally means "twinning", and is from the same Latin root as "Gemini".
Consonant length is distinctive in some languages, for instance Arabic, Danish, Estonian, Finnish, Classical Hebrew, Hungarian, Catalan, Italian, Japanese, Latin, Russian and Slovak. Most languages (including English) do not have distinctive long consonants. Vowel length is distinctive in more languages than consonant length, although several languages feature both independently (as in Japanese, Finnish, and Estonian), or have interdependent vowel and consonant length (as in Norwegian and Swedish).
Lengthened fricatives, nasals, laterals, approximants, and trills are simply prolonged. In lengthened stops, the obstruction of the airway is prolonged, delaying release. That is, the "hold" is lengthened. Long consonants are usually around one and a half or two times as long as short consonants, depending on the language.
In some languages, e.g., Italian, Swedish, Faroese, Icelandic and Ganda, consonant length and vowel length depend on each other. That is, a short vowel within a stressed syllable almost always precedes a long consonant or a consonant cluster, whereas a long vowel must be followed by a short consonant. In Classical Arabic, a long vowel was lengthened even more before permanently geminate consonants, however this is no longer exhibited in varieties of colloquial Arabic or even Modern Standard Arabic.
In other languages, such as Finnish, consonant length and vowel length are independent of each other. In Finnish, both are phonemic, such that taka "back", takka "fireplace", taakka "burden", and so forth are different, unrelated words; Finnish consonant length is also affected by consonant gradation. Another important phenomenon is that sandhi produces long consonants to word boundaries from an archiphonemic glottal stop, for example → "take it!"
Distinctive consonant length is usually restricted to certain consonants. There are very few languages that have initial consonant length; among them are Pattani Malay, Chuukese, a few Romance languages such as Sicilian and Neapolitan, and many of the High Alemannic German dialects (such as Thurgovian). Some African languages, such as Setswana and Ganda, also have initial consonant length—in fact, initial consonant length is very common in Ganda and is used to indicate certain grammatical features. In spoken Finnish and in spoken Italian, long consonants are produced between words by sandhi effects.
The reverse of gemination is the process in which a long consonant is reduced to a short one. This is called degemination. This is a pattern observed in Baltic-Finnic consonant gradation, where the strong grade (often, but not necessarily nominative) form of the word is degeminated into a weak grade (often all other cases) form of the word, e.g. taakka → taakan (burden, of the burden).
Arabic uses a diacritic shaped like a w called shadda ( ّ ). It is written above the consonant which is to be doubled. It is the most common diacritic (ḥaraka) that is sometimes used in ordinary spelling to avoid ambiguity. Example: <ر> ; مدرسة /madrasa/ "school" vs. مدرّسة /mudarrisa/ "teacher (f.)"
Danish has a three-way consonant length distinction. For instance:
- bunde 'bottoms'
- bundne 'bound' (pl.)
- bundene 'the bottoms'
The word 'bundene' can phonemically be analyzed as /bɔnənə/, with the middle schwa being assimilated to [n].
However, gemination does occur across words and across morphemes when the last consonant in a given word and the first consonant in the following word are the same fricative, nasal, or stop. For instance:
- calm man
- this saddle
- black coat
- back kick
- crack cocaine
- cattail (compare consonant length in "catfish")
With affricates, however, this does not occur. For instance:
- orange juice
A minimal pair demonstrating gemination in English is "night train" versus "night rain".
In some dialects gemination is also found when the suffix -ly follows a root ending in -l or -ll, as in:
In most instances, the absence of this doubling does not affect the meaning, though it may confuse the listener momentarily. Notable examples where the doubling does affect the meaning are the pairs "unaimed" versus "unnamed" , and "holy" versus "wholly" . (The latter two are identical in many areas, however.)
In some varieties of Welsh English, the process takes place indiscriminately between vowels, e.g. in money but it also applies with graphemic duplication (thus, orthographically dictated), e.g. butter 
Estonian has three phonemic lengths; however, the third length is a suprasegmental feature, which is as much tonal patterning as a length distinction. It is traceable to allophony caused by now-deleted suffixes, for example half-long linna < *linnan "of the city" vs. overlong linna < *linnahan "to the city".
Consonant length is phonemic in Finnish: For example, takka (transcribed with the length sign or with a doubled sign ), 'fireplace', but taka , 'back'. Consonant gemination occurs with simple consonants (hakaa : hakkaa) and between syllables in the pattern (consonant)-vowel-sonorant-stop-stop-vowel (palkka), but not generally in codas or with longer syllables. (This occurs in Sami languages, so there is the name of Sami origin Jouhkki). Sandhi may also produce geminates. Consonant and vowel gemination are both phonemic and occur independently, e.g. Mali, maali, malli, maallinen (Mali (a Karelian surname), paint, model and secular, respectively). See Finnish phonology.
In Ancient Greek, consonant length was distinctive, e.g., μέλω "I am of interest" vs. μέλλω "I am going to". The distinction has been lost in Standard Modern Greek and most varieties, with the exception of Cypriot such as in the pairs πολλοί 'a lot' vs. πολύ 'very'; the same is true for some varieties of the Aegean.
In Hungarian, consonant length is phonemic, e.g. megy , 'goes' and meggy , 'sour cherry'.
In Standard Italian, consonant length is distinctive. For example, "bevve" /'bevve/ ['bevve] means "he/she drank", while "beve" /'beve/ ['be:ve] means "he/she drinks/is drinking". Tonic syllables are bimoraic and are therefore composed of either a long vowel in an open syllable (beve) or a short vowel in a closed syllable (bevve). Double consonants occur not only within words but at word boundaries, where they are pronounced but not necessarily written: "chi + sa" = "chissà'" (who knows) [kis'sa] and "vado a casa" (I am going home) pronounced ['va:do ak'ka:sa]. See syntactic doubling (The last example refers to standard (Tuscan) and central-southern Italian).
In Japanese, consonant length is distinctive (as is vowel length). Gemination in the syllabary is represented with the sokuon, a small tsu: っ for hiragana in native words and ッ for katakana in foreign words. For example, 来た (きた, kita) means 'came; arrived', while 切った (きった, kitta) means 'cut; sliced'. バグ (bagu) means '(computer) bug', and バッグ (baggu) means 'bag'.
Latin and Romance languages
In Latin, consonant length was distinctive, as in anus "old woman" vs. annus "year". (Vowel length was also distinctive in Latin, but is not reflected in the orthography.) Gemination inherited from Latin still occurs in Italian and Catalan. It has been almost completely lost in French and completely in Romanian. In West Iberian languages, former Latin geminate consonants often evolved to new phonemes, including some lexicon with nasal vowels of Portuguese and Old Galician (that are partly of Celtic influence) as well most Spanish and , but phonetic length of both consonants and vowels is no longer distinctive.
Ganda is unusual in that gemination can occur word-initially, as well as word-medially. For example kkapa 'cat', jjajja 'grandfather' and nnyabo 'madam' all begin with geminate consonants.
There are three consonants that cannot be geminated: , and . Whenever morphological rules would geminate these consonants, and are prefixed with , and changes to . For example:
- -ye 'army' (root) → ggye 'an army' (noun)
- -yinja 'stone' (root) → jjinja 'a stone' (noun); jj is usually spelt ggy
- -wanga 'nation' (root) → ggwanga 'a nation' (noun)
- -lagala 'medicine' (root) → ddagala 'medicine' (noun)
In Polish, consonant length is distinctive. For example,
- rodziny – 'families';rodzinny – adjective of 'family'
- saki - 'sacks, bags'; ssaki - 'mammals',
- leki – 'medicines'; lekki – 'light' (adjective referring to weight only)
- Grecy – 'Greeks' (noun); greccy – 'Greek' (adjective).
Punjabi in its official script Gurmukhi uses a diacritic called an áddak ( ੱ ) (ਅੱਧਕ, Punjabi pronunciation: ) which is written above the word and indicates that the following consonant is geminate. Gemination is specially characteristic of Punjabi compared to other Indo-Aryan languages like Hindi-Urdu, where instead of the presence of consonant lengthening, the preceding vowel tends to be lengthened. Consonant length is distinctive in Punjabi, for example:
- ਦਸ – 'ten'; ਦੱਸ – 'tell' (verb)
- ਪਤਾ – 'aware of something'; ਪੱਤਾ – 'leaf'
- ਸਤ – 'truth' (liturgical); ਸੱਤ – 'seven'
- ਕਲਾ – 'art'; ਕੱਲਾ – 'alone'
In Russian, consonant length (indicated with two letters, as in ванна 'bathtub') may occur in several situations.
- Word formation or conjugation: длина ( 'length') → длинный ( 'long')
- Phonological alternations:
- высший ( 'highest').
In Ukrainian, geminates are found between vowels: багаття 'bonfire', подружжя 'married couple', обличчя 'face'. Geminates also occur at the start of a few words: лляний 'flaxen', forms of the verb лити 'to pour' (ллю , ллєш etc.), ссати 'to suck' and derivatives. Gemination is in some cases semantically crucial; for example, різниця (rʲizˈnɪt͡sʲɑ) means “difference” while різниться (rʲizˈnɪt͡sʲːɑ) means “differs”.
In Wagiman, an indigenous Australian language, consonant length in stops is the primary phonetic feature that differentiates fortis and lenis stops. Wagiman does not have phonetic voice. Word-initial and word-final stops never contrast for length.
In written language, consonant length is often indicated by writing a consonant twice ("ss", "kk", "pp", and so forth), but can also be indicated with a special symbol, such as the shadda in Arabic, or sokuon in Japanese. Estonian uses 'b', 'd', 'g' for short consonants, and 'p', 't', 'k' and 'pp', 'tt', 'kk' are used for long consonants.
In the International Phonetic Alphabet, long consonants are normally written using the triangular colon , e.g., penne ('feathers', 'pens', also a kind of pasta), though doubled letters are also used (especially for underlying phonemic forms).
- Catalan uses the raised dot (called an "interpunct") to distinguish a geminated l from a palatal ll.
Thus, paral·lel ("parallel") and Llull .
- In Hungarian, digraphs (e.g. sz /s/) are geminated by doubling the first letter only, thus ssz (rather than szsz) /sː/. (For a complete list of Hungarian digraphs, see Hungarian orthography.)
- The only digraph in Ganda, ny is doubled in the same way: nny .
- In Italian, geminated instances of the sound cluster (represented by the dygraph qu) are always indicated by writing cq, except in the word soqquadro and beqquadro, where the letter Q is doubled. The gemination of sounds , and , (spelled gn, sc(i), and gl(i), respectively) is not indicated because these consonants are always geminated when occurring between vowels. Also the sounds , (both spelled z) are always geminated when occurring between vowels, yet their gemination is sometimes shown, redundantly, by doubling the Z as, e.g., in pizza .
- In Swedish and Norwegian, the general rule is that a geminated consonant is written double, unless succeeded by another consonant. Hence hall ("hall"), but halt ("Halt!"). In Swedish, this does not apply to morphological changes (so kall, "cold" and kallt, "coldly" or compounds [so tunnbröd ("flatbread")]. The exception are some words ending in -m, thus hem ["home"] [but hemma ("at home")] and stam ["stem"], but lamm ["lamb", to distinguish the word from lam ("lame")], with a long /a/), as well as adjectives in -nn, so tunn, "thin" but tunt, "thinly" (whilst Norwegian has a rule always prohobiting two "m"s at the end of a word (with the exception being only a handful of proper names, and as a rule forms with suffixes reinsert the second "m", and the rule is that these word-final "m"s always cause the preceding vowel sound to be short (despite the spelling)).
Other representations of double letters
Doubled orthographic consonants do not always indicate a long phonetic consonant.
- In English, for example, the [n] sound of "running" is not lengthened. Consonant digraphs are used in English to indicate the preceding vowel is a short (lax) vowel, while a single letter often allows a long (tense) vowel to occur. For example, "tapping" (from "tap") has a "short A" , which is distinct from the diphthong "long A" in "taping" (from "tape").
- In Standard Modern Greek, doubled orthographic consonants have no phonetic significance at all.
- Hangul (the Korean alphabet) and its romanizations also use double consonants, but to indicate "fortis" articulation, not gemination.
- Crystal, David (2003). The Cambridge Encyclopedia of the English Language Second Edition, Cambridge University Press, pp. 335
- "Raddoppiamenti di vocali e di consonanti". Dizionario italiano d'ortografia e pronunzia (DOP). RAI. 2009. Retrieved November 11, 2009.
- Савко, И. Э. (2007). "10.3. Произношение сочетаний согласных". Весь школьный курс русского языка (in Russian). Современный литератор. p. 768. ISBN 985-456-150-X.978-5-17-035009-4 Check
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