Definition of "intruder" []

• Someone who intrudes. (noun)

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• "It uses image-processing software installed on its built-in micro-computer to determine whether the intruder is a threat."
• "So language was crafted to protect residents against prosecution or a civil suit if they blast away at an intruder, as long as they think the intruder is about to commit a forcible felony."
• "A watchdog simply barks to alert if an intruder is detected and can run in various sizes and breeds."