1. Proper noun.  (astronomy, dated) the Milky Way Galaxy, from when it was thought the Universe (our universe) had only one galaxy.
  2. Noun.  (context, now) The Milky Way; the apparent band of concentrated stars which appears in the night sky over earth. (defdate, from 14th c.) .
  3. Noun.  (galaxy) Any of the collections of many millions of stars, galactic dust, black holes, etc. existing as independent and coherent systems, of which there are billions in the known universe. (defdate, from 19th c.) .

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