dəˈsiməˈlāshən, (|)diˌsimə|l- noun
( -s )
Etymology: dis- (I) + -similation (as in assimilation )
: the act of making or the process of becoming dissimilar: as
a. : catabolism — contrasted with assimilation
b. : the development of dissimilarity between two identical or closely related sounds in a word ; also : the loss or dropping of one of two such sounds (as in Vulgar Latin pe l eg r inus, from Latin pe r eg r inus or as in the pronunciation ˈgəvənər instead of ˈgəvərnər for governor by speakers of English who do not ordinarily “drop” their r 's) — compare assimilation 4