An edict was a type of public legal announcement.
In 2370, Benjamin Sisko stated that while governments could break off relations with an edict, this was not so easy for individuals. (DS9: "The Siege")
In 2373, while inhabiting the body of Kes, Tieran planned to send out an edict that every citizen of Ilari must have a garden. (VOY: "Warlord")
By 2374, two of the most important Ramuran edicts were, that no one may leave Ramura and that no one reveal anything about them to other species. (VOY: "Unforgettable")