GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Fiat (?), n. [L., let it be done, 3d pers. sing., subj. pres., fr. fieri, used as pass. of facere to make.  Cf. Be.]
   1. An authoritative command or order to do something; an effectual decree.
   
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   His fiat laid the corner stone. Willis.
   
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   2. (Eng. Law) (a) A warrant of a judge for certain processes. (b) An authority for certain proceedings given by the Lord Chancellor's signature.
   
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   Fiat money, irredeemable paper currency, not resting on a specie basis, but deriving its purchasing power from the declaratory fiat of the government issuing it.
   
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