Learner's definition of DOMINANT
1 [more dominant; most dominant] : more important, powerful, or successful than most or all others
The university has/plays a dominant [=major] role in the local economy.
Money is the dominant [=main] force in consumer societies.
The company is now dominant in its market.
What is the dominant [=major, predominant] theme of the play?
It is the dominant culture/tribe in the region.
She has a very dominant [=domineering] personality.
the dominant female/male of the pack
3 biology : causing or relating to a characteristic or condition that a child will have if one of the child's parents has it
The companies are competing for dominance in the market. = The companies are competing for market dominance.
military/political dominance [=predominance]
male dominance [=the state of men or male animals having more power than women or female animals]
the French language's dominance in the region = the regional dominance of the French language