dominance

Concise Oxford English Dictionary © 2008 Oxford University Press:
dominance/ˈdɒmɪnəns/

▶noun

• 1 power and influence over others.

• 2 Genetics the phenomenon whereby one allelic form of a gene is expressed to the exclusion of the other.

• 3 Ecology the predominance of one or more species in a plant or animal community.

– derivatives
dominancy noun.