/ Dictionary / Index F fideicommissum: Meaning and Definition of Find definitions for: fi•de•i•com•mis•sum Pronunciation: (fī"dē-ī-ku-mis'um), [key] — pl. -mis•sa a request by a decedent that the heir or legatee to the estate convey a specified part of the estate to another person, or permit another person to enjoy such a part. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fideicommissary Fidei Defensor* 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