precept

law, rule, regulation, precept, statute, ordinance, canon mean a principle governing action or procedure. law implies imposition by a sovereign authority and the obligation of obedience on the part of all subject to that authority <obey the law>. rule applies to more restricted or specific situations <the rules of the game>. regulation implies prescription by authority in order to control an organization or system <regulations affecting nuclear power plants>. precept commonly suggests something advisory and not obligatory communicated typically through teaching <the precepts of effective writing>. statute implies a law enacted by a legislative body <a statute requiring the use of seat belts>. ordinance applies to an order governing some detail of procedure or conduct enforced by a limited authority such as a municipality <a city ordinance>. canon suggests in nonreligious use a principle or rule of behavior or procedure commonly accepted as a valid guide <the canons of good taste>.