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[koh-dom-uh-nuh nt] /koʊˈdɒm ə nənt/
Ecology. being one of two or more species that are equally dominant in a biotic community:
a forest in which oak and hickory are codominant.
Genetics. of or relating to two different alleles that are fully expressed in a heterozygous individual.
1895-1900; co- + dominant
Related forms
codominance, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for co-dominance


(genetics) (of genes) having both alleles expressed equally in the phenotype of the organism
Derived Forms
codominance, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for co-dominance



also co-dominant, 1926, from co- + dominant.

Online Etymology Dictionary, © 2010 Douglas Harper
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co-dominance in Medicine

codominant co·dom·i·nant (kō-dŏm'ə-nənt)
Of or relating to an equal degree of dominance of two genes, both being expressed in the phenotype of the individual.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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co-dominance in Science
  1. Relating to two alleles of a gene pair in a heterozygote that are both fully expressed. When alleles for both white and red are present in a carnation, for example, the result is a pink carnation since both alleles are codominant.

  2. Being one of two or more of the most common or important species in an ecological community. Like a dominant species, codominant species often influence the presence and type of other species in the community.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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