A number of close friends who usually do things together as a group.

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

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.

(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 situation in which the response to one problem creates a chain of problems, each making it more difficult to solve the original one.

(geometry) Synonym of circular segment

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

(geography) The line which marks approximately the northernmost place in the Southern Hemisphere where the sun does not set on the summer solstice and does not rise on the winter solstice.

(US, Canada) an intersection with a circular shape and, usually, a central island

Instrument for measuring azimuths. It is a graduated circle on a sight, gun carriage, searchlight, etc.