Definition

1. Noun:
   • The length of the closed curve of a circle: The distance around the outer boundary of a circle.
   • The boundary line encompassing an area or object: The outer edge or perimeter of any shape or object.
   • The size of something as given by the distance around it: A measurement describing how big something is by stating the length of its outer boundary.

Usage Examples

• Noun:
  • To find the circumference of a circle, multiply its diameter by pi (π).
  • The ancient wall marks the circumference of the old city.
  • The tree's circumference was over five meters.

Advanced Usage

• "To walk the circumference of": To walk all the way around the outer edge of something.
  • It took an hour to walk the entire circumference of the lake.

Variants and Related Words

• Circumferential (adj): Relating to or situated on the circumference.
  • The circumferential road runs around the city.

Synonyms

• Perimeter: The continuous line forming the boundary of a closed geometric figure.
• Girth: The measurement around the middle of something, especially a person's or animal's body.

Different Meanings

• In geometry, circumference specifically refers to the distance around a circle.
• In general use, circumference can refer to the distance around any roughly circular or rounded object or area.

Noun

1. the length of the closed curve of a circle
2. the boundary line encompassing an area or object
   • he had walked the full circumference of his land
   • a danger to all races over the whole circumference of the globe
3. the size of something as given by the distance around it