[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.
Law Library - American Law and Legal InformationFree Legal Encyclopedia: Ex proprio motu (ex mero motu) to File