Circumference

Part of speech: noun (n.)

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

2. A circle; anything circular. His ponderous shield . . . Behind him cast. The broad circumference Hung on his shoulders like the moon. Milton.

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

Part of speech: verb (v.)

To include in a circular space; to bound. [Obs.] Sir T. Browne.