noun
- a straight strip of wood, metal, or plastic marked with units of measurement, used for measuring or drawing straight lines
- a person who has supreme power over a country or people; a monarch or leader
Examples
- She used a ruler to draw a straight line across the paper.
- The ruler showed that the table was exactly three feet long.
- Students need a ruler for their geometry homework.
- The ancient ruler built many temples throughout his kingdom.
- She was known as a fair and just ruler who cared for her people.
- The ruler’s palace was decorated with gold and precious stones.
- He measured the book with a plastic ruler from his pencil case.