noun
fiat
FEE-aht/ˈfiːɑːt/
An order issued by someone with authority.
The judge's fiat compels the protesting participant to surrender her keys to the officer.

Etymology
From fieri, “to be done,” fiat meant “let it be done.” Its use in proclamations turned that expression of authority into a noun for an official order.
In context
I'm not going to allow offshore wind and he is such a power drunk that if he feels that he can stop it just by fiat then that's what he's going to do.
More examples
- The board imposes the new policy by fiat.
- A royal fiat orders the release of the prisoners.
- The governor's fiats leave local officials with little choice.
Forms
fiat · fiats