Neutralisation

The noun has 3 meanings:

Meaning #1: 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
  Synonyms: neutralization, neutralization reaction, neutralisation reaction

Meaning #2: action intended to keep a country politically neutral or exclude it from a possible war
  Synonym: neutralization

Meaning #3: action intended to nullify the effects of some previous action
  Synonyms: neutralization, counteraction

Neutralisation (or neutralization) in the immunological sense refers to the ability of antibodies to block the site(s) on bacteria or viruses that they use to enter their target cell. One exapmple of this within biology is a neutralizing antibody.

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