neutralisation (Noun) — 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.
neutralisation (Noun) — (euphemism) the removal of a threat by killing or destroying it (especially in a covert operation or military operation).
neutralisation (Noun) — Action intended to keep a country politically neutral or exclude it from a possible war. ex. "the neutralisation of Belgium"
neutralisation (Noun) — Action intended to nullify the effects of some previous action.