What is the meaning of Fiat?

An arbitrary or authoritative command or order to do something; an effectual decree.

Authorization, permission or (official) sanction.

A warrant of a judge for certain processes.

An authority for certain proceedings given by the Lord Chancellor's signature.

(Pertaining to) fiat currency.

To make (something) happen.

past participle of fiar

fiat

Expression of affirmation; make it so, so let it be, so be it

third-person singular present active subjunctive of fīō: "may it become", "may it be made", "may it happen"

third-person singular present passive subjunctive of faciō: "may it become", "may it be made", "may it happen"

Alternative form of fiyat (price)

Source: wiktionary.org