/ Dictionary / Index O open convention: Meaning and Definition of Find definitions for: o'pen conven'tion Pronunciation: [key] — U.S. Politics. U.S. Politics. a party convention at which delegates are free to vote for the candidate of their choice. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open communion open couplet Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language