/ Dictionary / Index B Big Board: Meaning and Definition of Find definitions for: Big' Board' Pronunciation: [key] — Informal. (sometimes l.c.)Informal. the New York Stock Exchange. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Big Bertha big-boned Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language