Definition from macmillandictionary.com
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We need new club rules before we start looking for more members.
the basic rules of the game
Anyone who breaks the rules will face disciplinary action.
You should always follow these simple rules when using electrical equipment.
You can’t do that, it’s against the rules!
They complain that businesses are being hampered by too many rules and regulations.
complicated grammatical rules
British rule over Hong Kong ended in 1997.
The country was in tatters after 13 years of Conservative rule.