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).

   “The set of all points (x, y) such that (x − 1)2 + y2 = r2 is a circle of radius r around the point (1, 0).”

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.

   “Children, please join hands and form a circle.”

Synonyms: bunch, gang, group, coil, loop, ring, disc, disk

verb

1. To travel around along a curved path.

   “The wolves circled the herd of deer.”

2. To surround.

   “A high fence circles the enclosure.”

3. To place or mark a circle around.

   “Circle the jobs that you are interested in applying for.”