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The definition of circle

17 Definitions of: circle

    1. noun, maths a closed plane curve every point of which is equidistant from a given fixed point, the centre. Equation: (x –h)2 + (y –k)2 = r2 where r is the radius and (h, k) are the coordinates of the centre; area πr2; circumference: 2πr
    2. noun, the figure enclosed by such a curve
    3. noun, theatre the section of seats above the main level of the auditorium, usually comprising the dress circle and the upper circle
    4. noun, something formed or arranged in the shape of a circle
    5. noun, a group of people sharing an interest, activity, upbringing, etc; set
    6. noun, a domain or area of activity, interest, or influence
    7. noun, a circuit
    8. noun, a process or chain of events or parts that forms a connected whole; cycle
    9. noun, a parallel of latitude. See also great circle, small circle
    10. noun, the ring of a circus
    11. noun, one of a number of Neolithic or Bronze Age rings of standing stones, such as Stonehenge, found in Europe and thought to be associated with some form of ritual or astronomical measurement
    12. noun, hockey. See striking circle
    13. noun, a circular argument. See vicious circle
    14. noun, come full circle to arrive back at one's starting point. See also vicious circle
    15. noun, go or run round in circles to engage in energetic but fruitless activity
    16. verb, to move in a circle (around)
    17. verb, to enclose in a circle; encircle
    18. Show me some examples of this word: circle
    19. Show me the etymology of the word: circle
Synonyms: set, school, band, round, realm, encompass, ring, disc, loop, hoop And more...
 

From Collins

©HarperCollins 2008. Collins English Dictionary definition of circle