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mid-15c., from Middle French dominant (13c.), from Latin dominantem (nominative dominans), present participle of dominari (see domination). Music sense is from 1819. Sexual bondage sense by c.1960. The noun is first recorded 1819, earliest in the musical sense.
dominant dom·i·nant (dŏm'ə-nənt)
Exercising the most influence or control.
Of, relating to, or being an allele that produces the same phenotypic effect whether inherited with a homozygous or heterozygous allele.
A dominant allele or trait.
An organism having a dominant trait.
in music, the fifth tone or degree of a diatonic scale (i.e., any of the major or minor scales of the tonal harmonic system), or the triad built upon this degree. In the key of C, for example, the dominant degree is the note G; the dominant triad is formed by the notes G-B-D in the key of C major or C minor. For further explanations of these relationships, see also cadence and harmony