noun (n)

• the act of retaining something(noun.act)

  Synonym:
  keeping, retention
  

  source: wordnet30
• something owned; any tangible or intangible possession that is owned by someone(noun.possession)

  Synonym:
  belongings, property
  

  source: wordnet30
• The act or state of sustaining, grasping, or retaining.(noun)

  source: webster1913