/ Dictionary / Index O open-line: Meaning and Definition of Find definitions for: o•pen-line Pronunciation: (ō'pun-līn"), [key] — adj. (of a radio or TV show) maintaining open telephone lines to permit listeners or viewers to phone a program with comments, questions, requests, etc.; call-in. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open letter open market Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language