/ Dictionary / Index S sightline: Meaning and Definition of Find definitions for: sight•line Pronunciation: (sīt'līn"), [key] — n. any of the lines of sight between the spectators and the stage or playing area in a theater, stadium, etc.: Some of the sightlines are blocked by columns. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sightless sightly Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language