Equator

  1. Proper noun.  The Earth’s equator.
  2. Noun.  (context, often) An imaginary great circle around the Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere.
  3. Noun.  A similar great circle on any sphere, especially on a celestial body, or on other reasonably symmetrical three-dimensional body.
  4. Noun.  A short form of the celestial equator.

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This entry was last updated on RefTopia from its source on 3/20/2012.