I. ˈfīˌa]t, -īə]; ˈfēˌa], ˈfēə], ˈfēˌä], ˈfēˌȧ]; usu ]d.+V\ noun
( -s )
Etymology: Latin, let it be done, 3d singular present subjunctive of fieri to become (used as passive of facere to do) — more at be , do
1. : official endorsement or sanction : permission
a colonial governor acting under the fiat of the king
2. : a command or act of will that creates something without or as if without further effort
3. : an authoritative decision of consciousness : mental determination of one of two or more alternatives
the fiat of will
a fiat of conscience
4. : an arbitrary edict : a summary judicial or executive pronouncement
the question of what conduct shall be made criminal … should never be determined by police fiat — Harvard Law Review
II. adjective
: established, sanctioned, or created by or as if by fiat
fiat value