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1) circle. The Columbia Encyclopedia, Sixth Edition. 2001
...circle, closed plane curve consisting of all points at a given distance from some fixed point, called the center. A circle is a conic section cut by a plane perpendicular...

2) circle. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...equidistant from a given fixed point, the center. 2. A planar region bounded by a circle. 3. Something, such as a ring, shaped like such a plane curve. 4. A circular...

3) circle. Roget s II: The New Thesaurus, Third Edition. 1995.
...Informal : bunch, gang. See GROUP. 1. To shut in on all sides: begird, beset, compass, encircle, encompass, environ, gird, girdle, hedge, hem, ring1, surround. See...

4) hour circle. The Columbia Encyclopedia, Sixth Edition. 2001
...hour circle, in astronomy, a secondary axis in the equatorial coordinate system. The hour circle of a celestial body is the great circle on the celestial sphere that...

5) great circle. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...1. A circle described by the intersection of the surface of a sphere with a plane passing through the center of the sphere. 2. A segment of such a circle representing...

6) polar circle. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...1. The Arctic Circle. 2. The Antarctic Circle....

7) vertical circle. The Columbia Encyclopedia, Sixth Edition. 2001
...vertical circle, in astronomy, the great circle on the celestial sphere that passes from the observer's zenith through a given celestial body. In the altazimuth coordinate...

8) Arctic Circle. The Columbia Encyclopedia, Sixth Edition. 2001
...Arctic Circle, imaginary circle on the surface of the earth at 661/2°N latitude, i.e., 231/2° south of the North Pole. It marks the northernmost point at which the...

9) Antarctic Circle. The Columbia Encyclopedia, Sixth Edition. 2001
...Antarctic Circle, imaginary circle on the surface of the earth at 661/2°S lat., i.e., 231/2° north of the South Pole. It marks the southernmost point at which the...

10) Antarctic Circle. The New Dictionary of Cultural Literacy, Third Edition. 2002
...Antarctic Circle An imaginary circle around the Earth about three-quarters of the way from the equator to the South Pole. 1 The Antarctic Circle corresponds to the...

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