Decree/dɪˈkriː/ Definition 1 of 2Pro Tip 1/3Legally Binding A decree has the power to enforce law or policy, similar to legislation. The king's decree became the new law of the land. Pro Tip 2/3Official Pronouncement Decrees are formal and authoritative, not casual suggestions. The mayor's decree on curfew hours had to be followed. Pro Tip 3/3Historical Usage Decrees are often associated with monarchies and historical rulings. The ancient decree was discovered in the palace archives.