• An imaginary great circle around Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere.
  • A similar great circle on any sphere, especially on a celestial body, or on other reasonably symmetrical three-dimensional body.
  • The midline of any generally spherical object, such as a fruit or vegetable, that has identifiable poles.
  • The celestial equator.


  • From Late Latin (circulus) aequator (diei et noctis).

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