The process or act of turning something off, disabling it, or stopping its operation.
From 'deactivate' with the suffix '-tion,' which creates abstract nouns from verbs describing actions or processes (like activation, creation, action).
Deactivation is critical in cybersecurity—when you deactivate an old account, your data doesn't just disappear; companies deactivate it (mark it inactive) while keeping records for years, which is why old accounts can sometimes be reactivated.
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