/ Dictionary / Index M mare liberum: Meaning and Definition of Find definitions for: ma•re li•be•rum Pronunciation: (mâr'ē lib'ur-um, mär'ā Lat. mä're lē'be-r&oobrevem&sec), [key] a body of navigable water to which all nations have unrestricted access. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Marek's disease maremma Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language