Meaning

noun action intended to keep a country politically neutral or exclude it from a possible war

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

noun (euphemism) the removal of a threat by killing or destroying it (especially in a covert operation or military operation)

originBorrowed from French neutralisation. By surface analysis, neutral + -ization or neutralize + -ation.

Etymology from Wiktionary, CC BY-SA 3.0