noun (n)

• action intended to keep a country politically neutral or exclude it from a possible war(noun.act)

  Example:
  The neutralization of Belgium.
  

  Synonym:
  neutralisation
  

  source: wordnet30
• a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water(noun.process)

  Synonym:
  neutralisation, neutralisation reaction, neutralization reaction
  

  source: wordnet30
• (euphemism) the removal of a threat by killing or destroying it (especially in a covert operation or military operation)(noun.act)

  source: wordnet30
• action intended to nullify the effects of some previous action(noun.act)

  Synonym:
  counteraction, neutralisation
  

  source: wordnet30
• The act or process of neutralizing, or the state of being neutralized.(noun)

  source: webster1913