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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

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British Dictionary definitions for codominant


  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 codominant


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

Online Etymology Dictionary, © 2010 Douglas Harper

codominant in Medicine


  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.

codominant 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.