:a closed plane (see 5plane 2b) curve every point of which is equidistant (see equidistant 1) from a fixed point within the curve
:the plane surface bounded by such a curve
:the orbit of a celestial body
:something in the form of a circle or section of a circle: such as
:an instrument of astronomical observation the graduated (see graduated 2a) limb of which consists of an entire circle
:a balcony or tier of seats in a theater
:a circle formed on the surface of a sphere by the intersection of a plane that passes through it
- Traffic slowed down around the circle.
:an area of action or influence :realm
- within the circle of probability
:fallacious reasoning in which something to be demonstrated is covertly assumed
:a group of persons sharing a common interest or revolving about a common center
- the sewing circle of her church
- the gossip of court circles
- political, social, and literary circles
:a territorial or administrative division or district
- The province is divided into nine circles.
:a circular course or path
- The children ran in circles around the tree.
- The conversation kept going in circles, and nothing got accomplished.