/ Dictionary / Index M mother tongue: Meaning and Definition of Find definitions for: moth•er tongue Pronunciation: (mu'ur tung' for 1 mu'ur tung&sec for 2), [key] the language first learned by a person; native language. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mother superior Motherwell Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language