Eternal

a.
  1. Without beginning or end of existence; always existing.
  2. Without end of existence or duration; everlasting; endless; immortal.
  3. Continued without intermission; perpetual; ceaseless; constant.
  4. Existing at all times without change; immutable.
  5. Exceedingly great or bad; -- used as a strong intensive.
  6. The Eternal City ,
    an appellation of Rome.

n.
  1. One of the appellations of God.
  2. That which is endless and immortal.