WordNet sense 1 (fixed or established especially by order or command):

appointed, decreed, ordained

WordNet sense 2 (established or decided beyond dispute or doubt):

settled

WordNet sense 3 (conforming to set usage, procedure, or discipline):

official

WordNet sense 4 (in accordance with fixed order or procedure or principle):

regular

WordNet sense 5 (formally laid down or imposed):

positive

WordNet sense 6 (being in accord with established forms and conventions and requirements (as e.g. of formal dress)):

formal

WordNet sense 7 (not subject to individual determination):

nonarbitrary, unarbitrary