Most important, powerful, or influential
the dominant classes
That does not dominate.
A dominant gene located on an autosome; a trait whose inheritance is determined by such a gene.
The common chord of the dominant note in a key, plus the minor seventh from that note (e.g., in the key of C, a chord of G-B-D-F). It is important in conventional harmony, as it naturally resolves to the tonic or subdominant
The fourth note of the diatonic scale of any key