Dictionary

fiat

noun fi·at \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

1
:  a command or act of will that creates something without or as if without further effort
2
:  an authoritative determination :  dictate <a fiat of conscience>
3
:  an authoritative or arbitrary order :  decree <government by fiat>
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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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