noun (n)

• the state or fact of existing(noun.state)

  Example:
  Laws in existence for centuries.
  

  Synonym:
  being, beingness
  Antonym:
  nonentity, nonexistence
  

  source: wordnet30
• everything that exists anywhere(noun.object)

  Example:
  The biggest tree in existence.
  

  Synonym:
  cosmos, creation, macrocosm, universe, world
  

  source: wordnet30
• The state of existing or being; actual possession of being; continuance in being; as, the existence of body and of soul in union; the separate existence of the soul; immortal existence.(noun)

  source: webster1913