Linguistics. A predictable phonetic variant of a phoneme. For example, the aspirated t of top, the unaspirated t of stop, and the tt (pronounced as a flap) of batter are allophones of the English phoneme /t/.
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tjterry6Is it to do with articulation or assimilation?I'm not sure what distinction you're trying to make here, but I'd say mostly assimilation, though both are involved. The mouth often takes the shape of the following sound. This affects the quality of the preceding sound. The "h" for example is articulated wherever the following vowel happens to be.