Definitions from Wiktionary ( )

▸ noun:  (geometry) 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).
▸ noun:  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.
▸ noun:  Any shape, curve or arrangement of objects that approximates to or resembles the geometric figures.
▸ noun:  Any thin three-dimensional equivalent of the geometric figures.
▸ noun:  A curve that more or less forms part or all of a circle.
▸ noun:  A specific group of persons; especially one who shares a common interest.
▸ noun:  The orbit of an astronomical body.
▸ noun:  (cricket) A line comprising two semicircles of 30 yards radius centred on the wickets joined by straight lines parallel to the pitch used to enforce field restrictions in a one-day match.
▸ noun:  (Wicca) A ritual circle that is cast three times deosil and closes three times widdershins either in the air with a wand or literally with stones or other items used for worship.
▸ noun:  (South Africa, Philippines, India) A traffic circle or roundabout.
▸ noun:  (obsolete) Compass; circuit; enclosure.
▸ noun:  (astronomy) An instrument of observation, whose graduated limb consists of an entire circle. When fixed to a wall in an observatory, it is called a mural circle; when mounted with a telescope on an axis and in Y's, in the plane of the meridian, a meridian or transit circle; when involving the principle of reflection, like the sextant, a reflecting circle; and when that of repeating an angle several times continuously along the graduated limb, a repeating circle.
▸ noun:  A series ending where it begins, and repeating itself.
▸ noun:  (logic) A form of argument in which two or more unproved statements are used to prove each other; inconclusive reasoning.
▸ noun:  A territorial division or district.
▸ noun:  (in the plural) A bagginess of the skin below the eyes from lack of sleep.
▸ verb:  (transitive) To travel around along a curved path.
▸ verb:  (transitive) To surround.
▸ verb:  (transitive) To place or mark a circle around.
▸ verb:  (intransitive) To travel in circles.
▸ noun:  A census-designated place in Yukon-Koyukuk Census Area, Alaska, United States. Erroneously thought to be on the Arctic Circle, which is 50 miles further north.
▸ noun:  A town, the county seat of McCone County, Montana, United States. Named after a cattle brand in the form of a circle.
▸ noun:  the Circle line of the London Underground, originally the Inner Circle.
▸ noun:  A surname from German.

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