noun (n)

• the act of giving something up(noun.act)

  Synonym:
  desertion, forsaking
  

  source: wordnet30
• withdrawing support or help despite allegiance or responsibility(noun.act)

  Example:
  His abandonment of his wife and children left them penniless.
  

  Synonym:
  defection, desertion
  

  source: wordnet30
• the voluntary surrender of property (or a right to property) without attempting to reclaim it or give it away(noun.act)

  source: wordnet30
• The act of abandoning, or the state of being abandoned; total desertion; relinquishment.(noun)

  source: webster1913