plural of crop circle

(projection) a circle whose plane is oblique to the axis of the primitive plane

(geometry) A circle defined as the intersection of the surface of a sphere and a plane which passes through the centre of the sphere.

a group of employees which meets regularly to resolve problems and improve working methods; part of the kaizen system

(geometry) Synonym of circular segment

The parallel of latitude that runs 66° 33′ 39″ north of the Equator, which marks approximately the southernmost place in the Northern Hemisphere where the sun does not set on the summer solstice and does not rise on the winter solstice.

a circle formed by a plane that cuts a sphere not through its centre

(netball) One of two semicircles in the goal thirds, radius 4.9 metres, in which the goal shooter and goal attack can shoot.

(geometry) A circle of radius 1. / (trigonometry, the unit circle) The circle of radius 1 with centre at the origin, used in defining trigonometric functions.

(soccer) The circle in the centre of the pitch which, at kick-off, the defending team may not enter until the attacking side has touched the ball.