noun (n)

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

  Synonym:
  abandonment, defection
  

  source: wordnet30
• the act of giving something up(noun.act)

  Synonym:
  abandonment, forsaking
  

  source: wordnet30
• The act of deserting or forsaking; abandonment of a service, a cause, a party, a friend, or any post of duty; the quitting of one's duties willfully and without right; esp., an absconding from military or naval service.(noun)

  source: webster1913