Definitions of circumference

To include in a circular space; to bound.

the size of something as given by the distance around it

A circle; anything circular.

The line that bounds a circle or any curved plane flgure; the distance around a circular body; circuit.

Circumferential.

Line that bounds a circle.

The boundary  line of a circle; distance around; circuit.

The line that bounds a circle, or that encompasses any figure; the space enclosed in a circle.

The line that bounds a circle; the measure of a circular body or a sphere round and round the measure round about of any other body is called its perimeter.