[ mahy-kroh-ev-uh-loo-shuh n or, esp. British, -ee-vuh- ]
/ ˌmaɪ kroʊˌɛv əˈlu ʃən or, esp. British, -ˌi və- /

noun Biology.

evolutionary change involving the gradual accumulation of mutations leading to new varieties within a species.
minor evolutionary change observed over a short period of time.

Origin of microevolution

First recorded in 1935–40; micro- + evolution

OTHER WORDS FROM microevolution

mi·cro·ev·o·lu·tion·ar·y, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for microevolution

Medical definitions for microevolution

[ mī′krō-ĕv′ə-lōōshən, -ē′və- ]


Evolution resulting from a succession of relatively small genetic variations that often cause the formation of new subspecies.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for microevolution

[ mī′krō-ĕv′ə-lōōshən ]

Evolutionary change below the level of the species, resulting from relatively small genetic variations. Microevolution produces new strains of microorganisms, for example, or the rise of a new subspecies. The accumulation of many microevolutionary changes results in macroevolution.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.