microevolution
mi·cro·evo·lu·tion
noun \-ˌe-və-ˈlü-shən also -ˌē-və-\Definition of MICROEVOLUTION
: comparatively minor evolutionary change involving the accumulation of variations in populations usually below the species level
— mi·cro·evo·lu·tion·ary \-shə-ˌner-ē\ adjective
First Known Use of MICROEVOLUTION
1911
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