noun (n)

• the property of a continuous and connected period of time(noun.attribute)

  Synonym:
  continuity
  

  source: wordnet30
• persistent determination(noun.attribute)

  Synonym:
  doggedness, perseverance, persistency, pertinacity, tenaciousness, tenacity
  

  source: wordnet30
• the act of persisting or persevering; continuing or repeating behavior(noun.act)

  Synonym:
  perseverance, perseveration
  

  source: wordnet30
• The quality or state of being persistent; staying or continuing quality; hence, in an unfavorable sense, doggedness; obstinacy.(noun)

  source: webster1913