An allophonic rule is a
phonologicalrule that says which allophonerealizes a phonemein a given phonemic environment. In other words, an allophonic rule is a rule that converts the phonemes in a phonemic transcriptioninto the allophones of the corresponding phonetic transcription. Every dialecthas a set of allophonic rules.
For example, in
General American, a non-regional dialect of American English, the voiceless alveolar stopphoneme IPA|/t/ is realized as the alveolar flapallophone IPA| [ɾ] when it is preceded by a non-lateral sonorantphoneme and, at the same time, followed by an unstressed vowelphoneme:
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