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[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
1935-40; micro- + evolution
Related forms
microevolutionary, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary Examples
microevolution in Medicine

microevolution mi·cro·ev·o·lu·tion (mī'krō-ěv'ə-lōō'shən, -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.
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microevolution in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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