/ Dictionary / Index U unilateralism: Meaning and Definition of Find definitions for: u•ni•lat•er•al•ism Pronunciation: (y"nu-lat'ur-u-liz"um), [key] — n. the advocacy or pursuit of a unilateral policy, esp. in disarmament. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unilateralism (Thesaurus) unilateral unilineal Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language