adverb (r)

• everlastingly; for all time(adv.all)

  Example:
  Rays...streaming perpetually from the sun.
  

  source: wordnet30
• without interruption(adv.all)

  Synonym:
  always, constantly, forever, incessantly, uninterruptedly
  

  source: wordnet30
• In a perpetual manner; constantly; continually.(adverb)

  source: webster1913