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microevolution

[mahy-kroh-ev-uh-loo-shuh n or, esp. British, -ee-vuh-]
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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 of microevolution

First recorded in 1935–40; micro- + evolution
Related formsmi·cro·ev·o·lu·tion·ar·y, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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microevolution in Medicine

microevolution

(mī′krō-ĕv′ə-lōōshən, -ē′və-)
n.
  1. 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.

microevolution in Science

microevolution

[mī′krō-ĕv′ə-lōōshən]
  1. 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.