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The specific allophone selected in a given situation is often predictable from the phonetic context, with such allophones being called positional variants, but some allophones occur in free variation. Replacing a sound by another allophone of the same phoneme usually does not change the meaning of a word, but the result may sound non-native or ...
The variation may be conditioned by the phonological, morphological, and/or syntactic environment in which the morpheme finds itself. Alternations provide linguists with data that allow them to determine the allophones and allomorphs of a language's phonemes and morphemes and to develop analyses determining the distribution of those allophones ...
Phonetic change can occur without any modification to the phoneme inventory or phonemic correspondences. This change is purely allophonic or subphonemic. This can entail one of two changes: either the phoneme turns into a new allophone—meaning the phonetic form changes—or the distribution of allophones of the phoneme changes.
A related process is coarticulation in which one segment influences another to produce an allophonic variation, such as vowels becoming nasalized before nasal consonants (/n, m, ŋ/) when the soft palate (velum) opens prematurely or /b/ becoming labialized as in "boot" [bʷuːt̚] or "ball" [bʷɔːɫ] in some accents.
There is significant allophonic variation in /əʉ/, including a backed allophone [ɔʊ] before a word-final or preconsonantal /l/. The first part of this allophone is in the same position as /ɔ/, but [ɔʊ] differs from it in that it possesses an additional closing glide, which also makes it longer than /ɔ/.
The alternation pattern is well maintained for the items listed immediately below, but its loss as a productive allophonic rule permits its abandonment for new usages of even well-established terms: while leaf~leaves in reference to 'outgrowth of plant stem' remains vigorous, the Toronto ice hockey team is uncontroversially named the Maple Leafs.
Therefore, if a C'/Cʔ~C: allophonic variation is possible, Kortlandt interprets the traditional voiced series as ejectives and the traditional murmured series is just as likely to be an allophonic variation that became phonemic, Kortlandt is reversing the roles of the geminated and plain stops.
Most cases of fusion lead to allophonic variation, though some sequences of segments may lead to wholly distinct phonemes. A common form of fusion is found in the development of nasal vowels, which frequently become phonemic when final nasal consonants are lost from a language. This occurred in French and Portuguese.