rule

1 a statement spelling out the proper procedure or conduct for an activity read the rules that are posted before you use the pool Synonyms bylaw, ground rule, reg, regulation Related Words code, constitution, decalogue, directory; act, law, ordinance, statute; behest, charge, command, commandment, decree, dictate, direction, directive, edict, fiat, instruction, order; axiom, fundamental, maxim, precept; moral, principle, value; ban, interdiction, prohibition, proscription, restriction; convention, custom, habit, manners, mores, practice (also practise), tradition, way; blueprint, canon, formula, guide, guideline, standard

2 lawful control over the affairs of a political unit (as a nation) the years during which Russia was under Communist rule Synonyms administration, authority, governance, government, jurisdiction, regime (also régime), regimen Related Words reign; dominion, power, sovereignty (also sovranty), supremacy, sway; command, leadership; direction, management, regulation, superintendence, supervision; autocracy, dictatorship, domination, hegemony, mastery, oppression, subjugation, tyranny

3 an inherited or established way of thinking, feeling, or doing one of the sacred rules of that ancient society was respect for the elderly Synonyms convention, custom, heritage, prescription, rubric, traditionRelated Words ethic, form, mode, mores, norm, principles, standards, values; birthright, inheritance, legacy; folklore, lore, superstition; culture, lifestyle