Definition of fiat 1 :a command or act of will that creates something without or as if without further effort According to the Bible, the world was created by

Definition of fiat 1 :a command or act of will that creates something without or as if without further effort According to the Bible, the world was created by fiat. 2 :an authoritative determination :dictate a fiat of conscience 3 :an authoritative or arbitrary order :decree government by fiat