Military fiat is a process whereby a decision is made and enforced by military means without the participation of other political elements. The Latin term fiat, translated as "let it be," suggests the autocratic attitude ascribed to such a process. For example, many coups involve the imposition of a new government by military fiat.
\ˈfē-ət, -ˌat, -ˌät; ˈfī-ət, -ˌat\
Latin, let it be done, 3d singular present subjunctive of fieri to become, be done — more at be
Date: circa 1631
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>