1. official instructions that say how things must be done or what is allowed
Usage: plural of rule
2. the normal or usual state of things
Usage: informal; in phrases like ‘that’s the rules’

1. third person singular present of rule; governs or controls
2. third person singular present of rule; makes an official decision

Examples

• The school has strict rules about uniforms.
• You must follow the rules of the game.
• Breaking traffic rules can result in fines.
• The judge rules on all court cases.
• She rules her household with kindness.
• The committee rules that the proposal is acceptable.
• Safety rules are posted throughout the building.