/ Dictionary / Index P propositional function: Meaning and Definition of Find definitions for: proposi'tional func'tion Pronunciation: [key] — Logic. Logic. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. propositional calculus propositus Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language