A church decree is a formal statement issued by a religious authority, such as a pope or bishop. The five crossword solutions for the term 'church decree' are CANON (5 letters), NISI (4 letters), EDICT (5 letters), UKASE (5 letters), and FIAT (4 letters). CANON refers to a rule or law of the church, while Nisi is a Latin term meaning 'UNLESS'. An EDICT is a formal proclamation issued by a ruler or government, and a UKASE is a similar proclamation issued by the Tsar of Russia. Finally, FIAT is a Latin term meaning 'let it be done'.