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.