precept

A rule or principle prescribing a particular course of action or conduct.

A direction or order issued by an authority; a writ, command, or process.

A commandment or direction given as a rule of action; teaching; instruction; especially, an injunction as to moral conduct; a rule of conduct; a maxim.

In law: A command or mandate in writing issued by a court or judge, as for bringing a person, record, or other matter before him, or for the collection of costs, etc., or for summoning jurors, etc.

In English law, a command or mandate in writing issued pursuant to law by an administrative officer.