/ Dictionary / Index B book share: Meaning and Definition of Find definitions for: book' share" Pronunciation: [key] a share of a mutual fund credited to the account of a shareholder without the physical issuance of a certificate evidencing ownership. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bookseller bookshelf Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language