/ Dictionary / Index P penni: Meaning and Definition of Find definitions for: pen•ni Pronunciation: (pen'ē), [key] — pl. pen•ni•a pen•nis. an aluminum coin of Finland, the 100th part of a markka. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: penni (Thesaurus) Penn Hills Pennie Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language