Superdominant

1. (law) Having an overwhelming proportion of market share, so as to be almost a monopoly.
2. Having a disproportionate degree of influence or salience.
3. (biology) Holding a position of absolute dominance.
4. Extremely dominating; controlling.
5. (genetics) Controlling or enhancing the expression of another pair of genes or chromosomes.
6. (anatomy, of an artery) Sufficiently large so as to control the blood flow to an area.
7. (forestry) Rising above the general level of the overstory.
8. (decision theory) Comprising the winning strategy in all cases.