/ Dictionary / Index I in principio*: Meaning and Definition of Find definitions for: in prin•ci•pi•o Pronunciation: (in prin-ki'pi-ô Eng. in-prin-sip'ē-ō&sec), [key] — Latin. Latin. at or in the beginning; at first. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. In Praise of Folly* in propria persona Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language