/ Dictionary / Index M Marshall Islands: Meaning and Definition of Find definitions for: Mar'shall Is'lands Pronunciation: [key] a group of 24 atolls in the N Pacific: formerly mandated to Japan; now under U.S. trusteeship. 27,096; 74 sq. mi. (192 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Marshallese Marshall Plan Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language