To make (something) even, inactive or ineffective.
The antidote neutralised the toxin.
To make (a territory, etc.) politically neutral.
All the powers involved are committed not only to stay out of a given territory, but also to reenter it if any one of them violates the independence of the neutralized country.
To make (an acidic or alkaline substance) chemically neutral.
From French neutraliser (first attested in 1642). By surface analysis, neutral + -ize.
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