extant, surviving

from The Collaborative International Dictionary of English v.0.48

existing \existing\ adj.
   1. having existence or being or actuality; as, much of the
      beluga caviar existing in the world is found in the Soviet
      Union and Iran. Opposite of {nonexistent}. [Narrower
      terms: {active, alive}; {extant, surviving}] Also See:
      {extant}.

   Syn: existent.
        [WordNet 1.5]

   2. Present. Opposite of {absent}.
      [WordNet 1.5]

   3. Presently existing; as, the existing system.
      [WordNet 1.5]