A decree or ordain is an authoritative order or command issued by a governing body. The crossword solutions for this term are FATWA (5 letters), ENACT (5 letters), EDICT (5 letters), FIAT (4 letters), UKASE (5 letters), and DESTINE (7 letters). A fatwa is a religious ruling issued by an Islamic scholar, while an ENACT is a law passed by a legislature. An EDICT is a proclamation issued by a sovereign or other authority, and a FIAT is an authoritative command or order. A UKASE is a proclamation or decree issued by the Russian government, and DESTINE is to determine or settle in advance.