noun (n)

• the act of continuing an activity without interruption(noun.act)

  Synonym:
  continuance
  Antonym:
  discontinuance, discontinuation
  

  source: wordnet30
• a part added to a book or play that continues and extends it(noun.communication)

  Synonym:
  sequel
  

  source: wordnet30
• a Gestalt principle of organization holding that there is an innate tendency to perceive a line as continuing its established direction(noun.cognition)

  Synonym:
  good continuation, law of continuation
  

  source: wordnet30
• the consequence of being lengthened in duration(noun.attribute)

  Synonym:
  lengthiness, prolongation, protraction
  

  source: wordnet30
• That act or state of continuing; the state of being continued; uninterrupted extension or succession; prolongation; propagation.(noun)

  source: webster1913