noun (n)

• any process whereby sounds or words are left out of spoken words or phrases(noun.process)

  Synonym:
  omission
  

  source: wordnet30
• (genetics) the loss or absence of one or more nucleotides from a chromosome(noun.event)

  source: wordnet30
• the omission that is made when an editorial change shortens a written passage(noun.communication)

  Example:
  An editor's deletions frequently upset young authors.
  

  Synonym:
  cut, excision
  

  source: wordnet30
• the act of deleting something written or printed(noun.act)

  source: wordnet30
• Act of deleting, blotting out, or erasing; destruction.(noun)

  source: webster1913