wrongfully seizing and holding (an office or powers) by force (especially the seizure of a throne or supreme authority); "a succession of generals who ruled by usurpation"
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
a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty