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[koh-dom-uh-nuh nt]
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  1. 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.
  2. Genetics. of or relating to two different alleles that are fully expressed in a heterozygous individual.

Origin of codominant

First recorded in 1895–1900; co- + dominant
Related formsco·dom·i·nance, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for codominance


  1. genetics (of genes) having both alleles expressed equally in the phenotype of the organism
Derived Formscodominance, noun
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

Word Origin and History for codominance



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

Online Etymology Dictionary, © 2010 Douglas Harper

codominance in Medicine


([object Object])
  1. 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.

codominance 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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