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What does rootkit mean?

Looking for the meaning or definition of the word rootkit? Here's what it means.

Noun
  1. (computer security) A set of software tools used by a third party after gaining access to a computer system in order to conceal the altering of files, or processes being executed by the third party without the user's knowledge.
Verb
  1. (transitive) To infect (a computer system) with a rootkit.
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