/ Dictionary / Index B box set: Meaning and Definition of Find definitions for: box' set' Pronunciation: [key] — Theat. Theat. a boxlike stage set consisting of flats that form the back wall, side walls, and often the ceiling, painted to represent the interior of a room. Also called, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. box seat box sill Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language