noun (n)

• a short note recognizing a source of information or of a quoted passage(noun.communication)

  Synonym:
  acknowledgment, citation, cite, credit, mention, reference
  

  source: wordnet30
• a passage or expression that is quoted or cited(noun.communication)

  Synonym:
  citation, quote
  

  source: wordnet30
• a statement of the current market price of a security or commodity(noun.communication)

  source: wordnet30
• the practice of quoting from books or plays etc.(noun.act)

  Example:
  Since he lacks originality he must rely on quotation.
  

  source: wordnet30
• The act of quoting or citing.(noun)

  source: webster1913