microevolution

[mahy-kroh-ev-uh-loo-shuhn or, esp. British, -ee-vuh-]
noun Biology.
1.
evolutionary change involving the gradual accumulation of mutations leading to new varieties within a species.
2.
minor evolutionary change observed over a short period of time.

Origin:
1935–40; micro- + evolution

microevolutionary, adjective
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American Heritage
Medical Dictionary

microevolution mi·cro·ev·o·lu·tion (mī'krō-ěv'ə-lōō'shən, -ē'və-)
n.
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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American Heritage
Science Dictionary
microevolution   (mī'krō-ěv'ə-l'shən)  Pronunciation Key 
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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Example sentences
As far as microevolution is concerned--a variation within a species, there is no argument.
Microevolution refers to genomic changes and the evolution of heritable traits within a species.
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