/ Dictionary / Index C codominant: Meaning and Definition of Find definitions for: co•dom•i•nant Pronunciation: (kō-dom'u-nunt), [key] — adj. being one of two or more species that are equally dominant in a biotic community: a forest in which oak and hickory are codominant. of or pertaining to two different alleles that are fully expressed in a heterozygous individual. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Codó codon Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language