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Assimilation is a regular sound change process by which a phoneme changes to match an adjacent phoneme in a word. If the phoneme changes to match the preceding phoneme, it is progressive assimilation. If the phoneme changes to match the following phoneme, it is regressive assimilation. The result of consonant assimilation is usually a geminate consonant.
Examples
Numerous examples can be found at Compound verbs in English consisting of Latin prefix and Latin verb.