The word "predominantly" means mainly or primarily; it indicates that something is mostly or largely characterized by a certain quality or condition. When something is described as predominant, it suggests that it is the most significant part of a larger context or situation. For example, if you say a group is predominantly young, it means that the majority of the group consists of young individuals.
The word "predominantly" comes from the Latin "praedominari," which means "to have authority over." The prefix "pre-" means "before," and "dominari" means "to dominate." This evolved in English to express the idea of something being more influential or present than others.