Definition of intruder noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ɪnˈtruːdə(r)//
    ; NAmE NAmE//ɪnˈtruːdər//
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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. See related entries: Criminals
  2. 2a person who is somewhere where they are not wanted The people in the room seemed to regard her as an unwelcome intruder.
  3. Extra examples He found a masked intruder in the kitchen. He was stabbed when he tackled an intruder armed with a knife. Intruders had forced their way into the house. Staff were instructed to repel intruders with physical force, if need be. security measures against intruders
See the Oxford Advanced American Dictionary entry: intruder