American English

Definition of intruder noun from the Oxford Advanced American Dictionary



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  1. 1a person who enters a building or an area illegally The intruder fired at least one more shot at the guard, then fled. Intruder alarms are being fitted in many schools as a way of improving security.
  2. 2a person who is somewhere where they are not wanted The people in the room seemed to regard her as an unwelcome intruder.
See the Oxford Advanced Learner's Dictionary entry: intruder