Princeton's WordNet

1. contribution, part, share(noun)

   the part played by a person in bringing about a result

   Synonyms:
   parting, contribution, division, component, role, donation, constituent, share, function, portion, part, percentage, voice, section, parcel, ploughshare, piece, office, character, theatrical role, plowshare, region, component part, persona

2. contribution, donation(noun)

   a voluntary gift (as of money or service or ideas) made to some worthwhile cause

   Synonyms:
   contribution, donation, part, share

3. contribution, donation(noun)

   act of giving in common with others for a common purpose especially to a charity

   Synonyms:
   contribution, donation, part, share

4. contribution(noun)

   an amount of money contributed

   Synonyms:
   donation, part, share

5. contribution(noun)

   a writing for publication especially one of a collection of writings as an article or story

   Synonyms:
   donation, part, share