/ Dictionary / Index P pinnation: Meaning and Definition of Find definitions for: pin•na•tion Pronunciation: (pi-nā'shun), [key] — n. Bot. pinnate condition or formation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pinnatifid pinnatiped Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language