An arbitrary or authoritative command or order to do something; an effectual decree.
"In some texts, you may encounter fiat as an alternative form of fiat money."
An automobile manufactured by the Italian firm Fiat S.p.A..
Alternative form of Fiat
In plain English: Fiat is an official order from someone with authority that must be followed immediately.
"The bank account was frozen because of a federal fiat ordering all suspicious transactions to be halted."
Usage: Use the noun fiat when referring to an official, often authoritarian decree issued by a government or authority figure without prior consultation. This term is distinct from casual orders because it implies that the command itself carries immediate legal force and validity simply due to who issued it.
To make (something) happen.
"The CEO's fiat to launch the product immediately surprised everyone in the boardroom."
In plain English: To fiat means to officially order something by using your authority as a leader.
"The new policy will not take effect until the president signs it by fiat."
Initialism of fix it again Tony.
"The new manager adopted a strict policy known as fiat, which was simply an initialism for fix it again Tony to ensure every problem was immediately resolved by the head technician."
The word fiat comes from the Latin phrase fīat, which means "let it be done." It entered English as a formal expression of authority or an official decree.