"dominant" in the noun sense
1. dominant
music) the fifth note of the diatonic scale
2. dominant allele, dominant
an allele that produces the same phenotype whether its paired allele is identical or different
"dominant" in the adjective sense
1. dominant
exercising influence or control
"television plays a dominant role in molding public opinion"
"the dominant partner in the marriage"
2. dominant
of genes) producing the same phenotype whether its allele is identical or dissimilar
3. prevailing, prevalent, predominant, dominant, rife
most frequent or common
"prevailing winds"
Source: WordNet® (An amazing lexical database of English)
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