n.
Pronunciation: - ˌ e-v ə - ' lü-sh ə n also - ˌ ē -v ə -
Function: noun
Date: 1911
: comparatively minor evolutionary change involving the accumulation of variations in populations usually below the species level
– mi · cro · evo · lu · tion · ary \ -sh ə - ˌ ner- ē \ adjective