/ Dictionary / Index O open letter: Meaning and Definition of Find definitions for: o'pen let'ter Pronunciation: [key] a letter, often of protest or criticism, addressed to a specific person, but intended to be brought to public attention. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open juncture open-line 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