firmament

  1. Noun.  (uncountable) The vault of the heavens; the sky.
  2. Noun.  (obsolete) basis.
  3. Noun.  The field or sphere of an interest or activity.
  4. Noun.  (archaic) In the Ptolemaic system, the eighth geocentric sphere, which carried the fixed stars.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

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