1. people who have power over a country or group of people
2. straight strips of wood, plastic, or metal marked with units of measurement, used for measuring or drawing straight lines

Examples

• The ancient rulers built magnificent palaces.
• Democratic rulers are chosen by the people.
• The students used rulers to draw straight lines in geometry class.
• She measured the paper with a 12-inch ruler.
• The art teacher handed out rulers for the drawing exercise.
• Medieval rulers often lived in castles.
• Metal rulers are more durable than plastic ones.