/ Dictionary / Index P principium: Meaning and Definition of Find definitions for: prin•cip•i•um Pronunciation: (prin-sip'ē-um), [key] — pl. -cip•i•a a principle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Príncipe principle Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language