noun (n)

• the part played by a person in bringing about a result(noun.act)

  Example:
  I am proud of my contribution in advancing the project.
  

  Synonym:
  part, share
  

  source: wordnet30
• a voluntary gift (as of money or service or ideas) made to some worthwhile cause(noun.possession)

  Synonym:
  donation
  

  source: wordnet30
• act of giving in common with others for a common purpose especially to a charity(noun.act)

  source: wordnet30
• an amount of money contributed(noun.possession)

  Example:
  He expected his contribution to be repaid with interest.
  

  source: wordnet30
• a writing for publication especially one of a collection of writings as an article or story(noun.act)

  source: wordnet30
• The act of contributing.(noun)

  source: webster1913