English dictionary fiat meaning and definition Definition and meaning of fiat at MeaningMonkey.org. fiat meaning and definition in the English Dictionary. FIAT nounDefinition of fiat (noun)a legally binding command or decision entered on the court record (as if issued by a court or judge)"a friend in New Mexico said that the order caused no trouble out there"synonyms: decree, edict, order, rescript Source: Princeton University Wordnet
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