/ Dictionary / Index I imperialism: Meaning and Definition of Find definitions for: im•pe•ri•al•ism Pronunciation: (im-pēr'ē-u-liz"um), [key] — n. the policy of extending the rule or authority of an empire or nation over foreign countries, or of acquiring and holding colonies and dependencies. advocacy of imperial interests. an imperial system of government. imperial government. the policy of so uniting the separate parts of an empire with separate governments as to secure for certain purposes a single state. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: imperialism (Thesaurus) imperial gallon imperial jade Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language