/ Dictionary / Index M Marquesas Islands: Meaning and Definition of Find definitions for: Mar•que'sas Is'lands Pronunciation: (mär-kā'zuz, -suz, -sus), [key] a group of French islands in the S Pacific. 5593; 480 sq. mi. (1245 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Marquesan marquess Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language