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intruder

noun [C]
 
 
/ɪnˈtruː.dər/ US  /-dɚ/

Definition

C2 someone who is in a place or situation where they are not wanted: I feel like an intruder when I visit their home.Unpleasant people in generalUnpleasant men C2 someone who enters a place without permission in order to commit a crime: Intruders had entered the house through a back window.Miscellaneous criminals
(Definition of intruder noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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