Illustration of circle
- AB diameter
- C center
- CD CA CB radii
- EKF arc on chord EF
- EFKL (area) segment on chord EF
- ACD (area) sector
- GH secant
- TPM tangent at point P
- EKFBPDA circumference
often attributive
1
b
: a closed plane (see plane entry 6 sense 2b) curve every point of which is equidistant (see equidistant sense 1) from a fixed point within the curve
c
: the plane surface bounded by such a curve
2
archaic
: the orbit of a celestial body
3
: something in the form of a circle or section of a circle: such as
a
: diadem
b
: an instrument of astronomical observation the graduated (see graduated sense 2a) limb of which consists of an entire circle
c
: a balcony or tier of seats in a theater
d
: a circle formed on the surface of a sphere by the intersection of a plane that passes through it
circle of latitude
e
: rotary sense 2
Traffic slowed down around the circle.
4
: an area of action or influence : realm
within the circle of probability
5
6
: a group of persons sharing a common interest or revolving about a common center
the sewing circle of her church
family circle
the gossip of court circles
political, social, and literary circles
7
: a territorial or administrative division or district
The province is divided into nine circles.
8
: a curving side street
lived on Kimberly Circle
9
: a circular course or path
The children ran in circles around the tree.
The conversation kept going in circles, and nothing got accomplished.
circled; circling
ˈsər-k(ə-)liŋ
1
: to enclose in or as if in a circle
The teacher circled the misspelled words.
2
: to move or revolve around
satellites circling the earth
1
a
: to move in or as if in a circle
The airplane circled around over the airport.
b
: circulate
Thy name shall circle round the gaping throng …—Lord Byron
c
: to circle around before making an attack
sharks circling in the water
2
: to describe or extend in a circle
… the lighthouse sent out its slow steady circling beam.—R. O. Bowen
Cite this Entry
“Circle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/circle. Accessed 4 Aug. 2026.
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