CIRCLE

noun

1. A two-dimensional geometric figure, a line, consisting of the set of all those points in a plane that are equally distant from a given point (center).
2. A two-dimensional geometric figure, a disk, consisting of the set of all those points of a plane at a distance less than or equal to a fixed distance (radius) from a given point.
3. Any shape, curve or arrangement of objects that approximates to or resembles the geometric figures.

verb

1. To travel around along a curved path.
2. To surround.
3. To place or mark a circle around.