verb (v)

• make less severe or harsh or extreme(verb.change)

  Example:
  Please modify this letter to make it more polite.
  

  source: wordnet30
• add a modifier to a constituent(verb.change)

  Synonym:
  qualify
  

  source: wordnet30
• cause to change; make different; cause a transformation(verb.change)

  Synonym:
  alter, change
  

  source: wordnet30
• To change somewhat the form or qualities of; to alter somewhat; as, to modify a contrivance adapted to some mechanical purpose; to modify the terms of a contract.(verb)

  source: webster1913