The term "dominant" refers to something that is most influential or prevalent in a particular context. In biology, for example, a dominant trait is one that is expressed in an organism even if only one copy of the gene is present. This concept can also apply to social structures, where a dominant group holds more power or influence over others. In ecology, a dominant species is one that has a significant impact on its environment and community. This species often outcompetes others for resources, shaping the ecosystem. Understanding dominance helps in studying relationships within ecosystems and social dynamics.