trespasser Meaning, Definition & Usage
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       noun someone who intrudes on the privacy or property of another without permission
       
       
interloper; intruder.
 
WordNet
Tres"pass*er noun
Definitions
One who commits a trespass ; as:(a) (Law) One who enters upon another's land, or violates his rights. (b) A transgressor of the moral law; an offender; a sinner.