/ Dictionary / Index F fiat: Meaning and Definition of Find definitions for: fi•at Pronunciation: (fē'ät, -at fī'&schwat, -at), [key] — n. an authoritative decree, sanction, or order: a royal fiat. a formula containing the word fiat, by which a person in authority gives sanction. an arbitrary decree or pronouncement, esp. by a person or group of persons having absolute authority to enforce it: The king ruled by fiat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fiat (Thesaurus) fiasco fiat justitia, ruat caelum* Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language