1. the distance around the edge of a circle or round object
Usage: geometry
2. the outer boundary or edge of any round or curved area

Examples

• The circumference of the Earth at the equator is about 24,901 miles.
• To find the circumference of a circle, multiply the diameter by pi.
• She walked around the entire circumference of the lake.
• The tree’s circumference measured six feet around.
• The circumference of the wheel determines how far the bicycle travels with each rotation.
• Scientists measured the circumference of the crater to estimate its size.