/ Dictionary / Index P plenish: Meaning and Definition of Find definitions for: plen•ish Pronunciation: (plen'ish), [key] — v.t. Chiefly Scot. to fill up; stock; furnish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plenipotentiary plenitude Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language