noun (n)

• the act of decreasing or reducing something(noun.act)

  Synonym:
  decrease, diminution, step-down
  Antonym:
  increase, step-up
  

  source: wordnet30
• any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent(noun.process)

  Synonym:
  reducing
  

  source: wordnet30
• the act of reducing complexity(noun.act)

  Synonym:
  simplification
  

  source: wordnet30
• The act of reducing, or state of being reduced; conversion to a given state or condition; diminution; conquest; as, the reduction of a body to powder; the reduction of things to order; the reduction of the expenses of government; the reduction of a rebellious province.(noun)

  source: webster1913