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rule

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noun American English pronunciation: rule /rul/ 
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singularrule
pluralrules
  1. 1
    [countable] a statement explaining what someone can or cannot do in a particular system, game, or situation

    We need to change the club rules before we start looking for new members.

    rule of:

    the basic rules of the game

    break a rule (=not obey a rule):

    Anyone who breaks the rules will face disciplinary action.

    follow/obey a rule:

    You should always follow these simple rules when using electrical equipment.

    against the rules:

    You can't do that, it's against the rules!

    rules and regulations:

    They complain that businesses are being hampered by too many rules and regulations.

  2. 2
    [uncountable] the person, country, political or religious group, etc. that officially controls or governs a place

    British rule over Hong Kong ended in 1997.

    under someone's rule:

    He admitted there were killings under his rule but said reports were exaggerated.

    a period of military rule

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