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PHONOLOGY/PHONETICS: a process in which one or more segments become adapted in one or more aspects to a neighbouring segment. EXAMPLE: in English the alveolar nasal of the prefix /in-/ changes to [l] in illegal (complete convergence) and to [m] in input (partial convergence). In the latter case the change is from alveolar to labial under influence of the neighbouring labial segment [p]. When assimilation takes place between two vowels it is more commonly referred to as vowel harmony.