raciation

noun
ra·​ci·​a·​tion | \ˌrāshēˈāshən\
plural -s

Definition of raciation 

: differentiation of local infraspecific groups within a population through continued selection for ecologically useful variations under conditions of at least partial isolation — compare speciation

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History and Etymology for raciation

irregular (influenced by speciation) from race entry 7 + -ation

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