adjective

1. exercising authority or influence; dominating; ruling; prevailing
2. Genetics designating or relating to that one of any pair of allelic hereditary factors which, when both are present in the germ plasm, dominates over the other and appears in the organism
3. Music of or based upon the fifth tone of a diatonic scale

Etymology: L dominans, prp. of dominari: see dominate

noun

1. Ecol. that species of plant or animal most numerous in a community or exercising control over the other organisms by its influence upon the environment
2. Genetics a dominant character or factor
3. Music the fifth note of a diatonic scale