noun \ˈfē-ət, -ˌat, -ˌät; ˈfī-ət, -ˌat\

: an official order given by someone who has power : an order that must be followed

Full Definition of FIAT

:  a command or act of will that creates something without or as if without further effort
:  an authoritative determination :  dictate <a fiat of conscience>
:  an authoritative or arbitrary order :  decree <government by fiat>

Examples of FIAT

  1. He runs the company by fiat.
  2. <the school principal issued a fiat that caps were not to be worn inside the school, and that was that>

Origin of FIAT

Latin, let it be done, 3d singular present subjunctive of fieri to become, be done — more at be
First Known Use: circa 1631


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