/ Dictionary / Index F first mortgage: Meaning and Definition of Find definitions for: first' mort'gage Pronunciation: [key] a mortgage having priority over other mortgages on property. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. first messenger first name Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language