Predominantly means mostly, mainly, in the greater part — the bigger share, without pretending there is nothing else. A class that is predominantly female has more girls than boys, but not only girls. A diet that is predominantly rice means rice is the main food, not the only food. Teachers, reports, and news like this word because it is exact. Everyday speech often just says mostly or mainly; predominantly sounds a bit more careful, like you measured it. It is an adverb, so it tells you how something is, not what kind of thing it is.

主要地；大多；以…為主