1. the size of something as given by the distance around it
Similar word(s): perimeter
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
Similar word(s): circuit
3. the length of the closed curve of a circle
1. (obsolete, transitive) To include in a circular space; to bound.