If the phoneme changes to match the preceding phoneme, it is progressive assimilation ( also left to right, perseveratory, or preservative assimilation). If the phoneme changes to match the following phoneme, it is regressive assimilation ( also right to left or anticipatory assimilation). If there is a mutual influence between the two phonemes, it is reciprocal assimilation. In the latter case the two phonemes can fuse completely and give a birth to a different one. This is called a coalescences. Assimilation may result in the neigbouring segments becoming identical, yielding a geminate consonant, this is complete assimilation. In other cases, only some features of phoneme assimilate, e.g. voicing or place of articulation, this is partial assimilation.Examples:Complete assimilationThe word assimilation itself ( from Latin ad+smile) illegible ( in+legible)
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