/ Dictionary / Index B book bag: Meaning and Definition of Find definitions for: book' bag" Pronunciation: [key] a bag or satchel used esp. by a student for carrying books. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. book bookbinder Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language