noun. The boundary line of a circle.

noun. undefined

noun. The boundary line of an area or object.

noun. The length of such a line.

noun. The margin or area surrounding something.

To include in a circular or spherical space.

noun. The line that bounds a circle; by extension, the bounding line of any regular plane curvilinear figure; a periphery: as, the circumference of a circle or an ellipse. The circumference of a sphere is that of a great circle of the sphere.

noun. Hence Loosely, any bounding line: as, the circumference of a city.

noun. The space included in a circle; anything circular in form.

noun. A going about; circumlocution.

transitive verb. To include in a circular space; to bound.

noun. The line that goes round or encompasses a circular figure; a periphery.

noun. A circle; anything circular.

noun. The external surface of a sphere, or of any orbicular body.

noun. The line that bounds a circle or other two-dimensional figure

noun. The length of such a line

noun. The surface of a round or spherical object

verb. To include in a circular space; to bound.

noun. the boundary line encompassing an area or object

noun. the length of the closed curve of a circle

noun. the size of something as given by the distance around it

"It follows directly from this discussion, that for our sphere-beings the circumference of a circle first increases with the radius until the “circumference of the universe” is reached, and that it thenceforward gradually decreases to zero for still further increasing values of the radius."

center  middle  

boundary  

diameter  perimeter  radius  

border  borderline  boundary line  delimitation  length  

arc  curvature  diameter  dimension  expanse  

O  ambit  annular muscle  annulus  areola