A decree formal is a type of official order issued by a government or other authority. The crossword solutions for this term are NISI (4 letters), EDICT (5 letters), ARRET (5 letters), UKASE (5 letters), IRADE (5 letters), FIAT (4 letters), and ORDAIN (6 letters). NISI is a Latin term meaning 'UNLESS' and is used to refer to a court order that is not yet final. An EDICT is a proclamation issued by a ruler or government, usually with the force of law. An ARRET is a French term for a decree or EDICT. A UKASE is a Russian term for an imperial order or proclamation. An IRADE is a Turkish term for a royal decree or command. FIAT is a Latin term meaning 'let it be done' and is used to refer to an authoritative order or decree. Lastly, ORDAIN is a verb meaning to issue an authoritative order or decree.