Longman Dictionary of Contemporary English homepage

intruder

 noun
     
in‧trud‧er [countable]
1 someone who illegally enters a building or area, usually in order to steal something:
The police think the intruder got in through an unlocked window.
2 someone who is in a place where they are not wanted:
At first I felt like an intruder in their family.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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