Epenthesis of a vowel is known as anaptyxis (/ˌænəpˈtɪksɪs/, from Greek "unfolding"). Some accounts distinguish between "intrusive" optional vowels, vowel-like releases of consonants as phonetic detail, and true epenthetic vowels that are required by the phonotactics of the language and are acoustically identical with phonemic vowels.
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This characteristic places the language of these documents earlier than 1st MIA, for example, rukma urukmannu, rtanma artamna. (iv) Anaptyxis was quite frequent, for example, Indra Indara smara mumara. (v) v b initially, for example, virya birya, vrdhasva bardamva. (vi) r ar, for example, rta arta, vrdh bard-.
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Vowels are regularly lengthened before ns and nct (in the latter of which the n is lost) and possibly before nf and nx as well. Anaptyxis, the development of a vowel between a liquid or nasal and another consonant, preceding or following, occurs frequently in Oscan; if the other consonant precedes, the new vowel is the same as that of the preceding vowel. If the other consonant follows, the new vowel is the same as that of the following vowel.
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In phonology, epenthesis (; Greek ) means the addition of one or more sounds to a word, especially to the interior of a word (at the beginning prothesis and at the end paragoge are commonly used). The word epenthesis comes from "in addition to" and en "in" and thesis "putting". Epenthesis may be divided into two types: excrescence, for the addition of a consonant, and svarabhakti, or anaptyxis (), for the addition of a vowel. The opposite process, where one or more sounds are removed, is referred to as elision.
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For those who, given their native language background, may have trouble pronouncing (certain) consonant clusters, there is the option of inserting buffer vowels between them, as long as they differ sufficiently from the phonological vowels and are pronounced as short as possible. This mechanism can be described as a form of anaptyxis (vocalic epenthesis). Possible choices include , , and (but not , which is the rounded counterpart of and thus a valid realization of ). The resulting added syllables are completely ignored by the grammar, including for the purposes of stress determination.
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Lojban—a constructed language that seeks logically-oriented grammatical and phonological structures—uses a number of consonant clusters in its words, and since it is designed to be as universal as possible, it allows a type of anaptyxis called "buffering" to be used if a speaker finds a cluster difficult or impossible to pronounce. A vowel sound that is nonexistent in Lojban (usually "ɪ" as in "hit") is added between two consonants to make the word easier to pronounce. Despite altering the phonetics of a word, the use of buffering is completely ignored by grammar. Also, the vowel sound used must not be confused with any existing Lojban vowel.
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