Breadcrumb Home > 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: tatterdemalion Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language