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. [ 1913 Webster ]

His fiat laid the corner stone. Willis. [ 1913 Webster ]

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. [ 1913 Webster ]

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. [ 1913 Webster ]