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dissimilate (v.)

"make different, cause to be unlike," 1821, on model of assimilate, from dis- + Latin similis "like, resembling, of the same kind," from Old Latin semol "together" (from PIE root *sem- (1) "one; as one, together with"). In linguistics, of sounds, "to become unlike, to diverge," by 1860. Related: Dissimilated; dissimilating.

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Definitions of dissimilate from WordNet

dissimilate (v.)
become dissimilar by changing the sound qualities;
These consonants dissimilate
dissimilate (v.)
make dissimilar; cause to become less similar;
dissimilate (v.)
become dissimilar or less similar;
These two related tribes of people gradually dissimilated over time
From wordnet.princeton.edu