neutralisation

from WordNet (r) 3.0 (2006)

neutralisation
    n 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 [syn: {neutralization},
         {neutralisation}, {neutralization reaction},
         {neutralisation reaction}]
    2: (euphemism) the removal of a threat by killing or destroying
       it (especially in a covert operation or military operation)
       [syn: {neutralization}, {neutralisation}]
    3: action intended to keep a country politically neutral or
       exclude it from a possible war; "the neutralization of
       Belgium" [syn: {neutralization}, {neutralisation}]
    4: action intended to nullify the effects of some previous
       action [syn: {neutralization}, {neutralisation},
       {counteraction}]

from The Collaborative International Dictionary of English v.0.48

neutralisation \neutralisation\ n.
   Same as {neutralization}. [Chiefly Brit.]
   [WordNet 1.5]