/ Dictionary / Index M mortmain: Meaning and Definition of Find definitions for: mort•main Pronunciation: (môrt'mān"), [key] — n. Law. the condition of lands or tenements held without right of alienation, as by an ecclesiastical corporation; inalienable ownership. the perpetual holding of land, esp. by a corporation or charitable trust. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mortmain (Thesaurus) mortling Morton Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language