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[spee-shee-ey-shuh n, -see-ey-] /ˌspi ʃiˈeɪ ʃən, -siˈeɪ-/
noun, Biology.
the formation of new species as a result of geographic, physiological, anatomical, or behavioral factors that prevent previously interbreeding populations from breeding with each other.
Origin of speciation
1895-1900; speci(es) + -ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for speciation


the evolutionary development of a biological species, as by geographical isolation of a group of individuals from the main stock
Word Origin
C20: from species + -ation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for speciation

1906; see species + -ation.

Online Etymology Dictionary, © 2010 Douglas Harper
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speciation in Medicine

speciation spe·ci·a·tion (spē'shē-ā'shən, -sē-)
The evolutionary formation of new biological species, usually by the division of a single species into two or more genetically distinct ones.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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speciation in Science
The formation of new biological species by the development or branching of one species into two or more genetically distinct ones. The divergence of species is thought to result primarily from the geographic isolation of a population, especially when confronted with environmental conditions that vary from those experienced by the rest of the species, and from the random change in the frequency of certain alleles (known as genetic drift). According to the theory of evolution, all life on Earth has resulted from the speciation of earlier organisms. See also adaptive radiation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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