1. The distance around the edge of a circle or other curved shape.
Usage: Plural form of circumference; commonly used in geometry and mathematics.
2. The outer boundary or edge of an area or object.
Usage: Used more broadly to refer to the outer limits of any enclosed space.

Examples

• The circumferences of the two circles are different because they have different radii.
• We measured the circumferences of several tree trunks to estimate their ages.
• The circumferences of the planets vary greatly depending on their size.
• Students calculated the circumferences using the formula 2πr.
• The circumferences of the wheels on the bicycle are identical.
• The architect marked the circumferences of the proposed building on the ground.