(biology) the field of science concerned with processes of communication and control (especially the comparison of these processes in biological and artificial systems)
a knowledge domain that you are interested in or are communicating about; "it was a limited domain of discourse"; "here we enter the region of opinion"; "the realm of the occult"
territory over which rule or control is exercised; "his domain extended into Europe"; "he made it the law of the land"
the set of values of the independent variable for which a function is defined
the scientific study of food and drink (especially in humans)
(physiology) the organic process of nourishing or being nourished; the processes by which an organism assimilates food and uses it for growth and maintenance