1. an official regulation or principle governing conduct or procedure
2. control or dominion over a territory or people
3. a straight strip of wood, metal, or plastic used for measuring or drawing straight lines

1. to exercise ultimate power or authority over an area and its people
2. to make an official decision about something
3. to be the dominant influence on something

Examples

• The school has a strict rule against using phones in class.
• Queen Elizabeth ruled England for over 70 years.
• Use a rule to draw a straight line across the paper.
• The judge will rule on the case tomorrow.
• Emotion ruled his decision-making process.
• Traffic rules help keep drivers safe.
• The dictator ruled with an iron fist.
• Common sense should rule in this situation.