/ Dictionary / Index E expansionism: Meaning and Definition of Find definitions for: ex•pan•sion•ism Pronunciation: (ik-span'shu-niz"um), [key] — n. a policy of expansion, as of territory or currency: the colonial expansionism of Europe in the 19th century. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: expansionism (Thesaurus) expansion chamber expansion joint Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language