The word dominant has several possible meanings:
- In music theory, the dominant or dominant note (second most important) of a key is that which is a perfect fifth above the tonic; in just intonation the note whose pitch is 1.5 times the frequency of the tonic note's pitch and in twelve tone equal temperament is is 7 semitones or 700 cents above the tonic.
- A dominant gene is one that is expressed when heterozygous with a recessive allele of the gene.
- In BDSM, Dominant is a more precise term for a top in BDSM - see dominant (BDSM)