- fiat
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/fee"aht, -at; fuy"euht, -at/, n.1. an authoritative decree, sanction, or order: a royal fiat.2. a formula containing the word fiat, by which a person in authority gives sanction.3. an arbitrary decree or pronouncement, esp. by a person or group of persons having absolute authority to enforce it: The king ruled by fiat.[1625-35; < L: let it be done, 3rd sing. pres. subj. of fieri to become]
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Universalium. 2010.