microevolution

[mahy-kroh-ev-uh-loo-shuh n or, esp. British, -ee-vuh-]
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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
Related formsmi·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

Contemporary Examples of microevolution

  • Biologists use the phrase “microevolution” to refer to changes within a group of organisms over a relatively short period of time.

    The Daily Beast logo
    Sarah Palin, Creationist?

    Benjamin Sarlin

    November 19, 2009

  • Benjamin Sarlin reads between the lines of her views on "microevolution."

    The Daily Beast logo
    Sarah Palin, Creationist?

    Benjamin Sarlin

    November 19, 2009

  • In doing so, however, she manages to obscure the extent of those creationist beliefs by citing her acceptance of “microevolution.”

    The Daily Beast logo
    Sarah Palin, Creationist?

    Benjamin Sarlin

    November 19, 2009


microevolution in Medicine

microevolution

[mī′krō-ĕv′ə-lōōshən, -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.

microevolution in Science

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.