noun (n)

• the apparent surface of the imaginary sphere on which celestial bodies appear to be projected

  masa ketara permukaan sfera khayalan yang di atas langit tubuh tampaknya diunjurkan

  Synonym:
  celestial sphere, empyrean, heavens, sphere, vault of heaven, welkin
  

  source: wordnet30
• Fixed foundation; established basis.

  tetap foundation; penubuhan dasar.

  source: webster1913