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[Latin, Let it be done.] In old English practice, a short order or warrant of a judge or magistrate directing some act to be done; an authority issuing from some competent source for the doing of some legal act.
One of the proceedings in the English Bankruptcy practice: a power, signed by the lord chancellor and addressed to the court of bankruptcy, authorizing the petitioning creditor to prosecute his complaint before that court. By the statute 12 & 13 Vict., c. 116, fiats were abolished.
Arbitrary or authoritative order or decision.
fiatnoun authoritative order, authorization, command, decree, decree having the force of law, dictate, direction, edict, enactment, hest, imperium, imposition, instruction, iussum, judgment, mandamus, mandatum, order, prescript, prescription, pronouncement, regulation, rule, sanction, ukase, warrant
See also: brevet, canon, declaration, decree, dictate, direction, directive, edict, enactment, law, license, mandate, monition, order, ordinance, permit, precept, proclamation, pronouncement, requirement, writ