'Trespasser' definitions:

Definition of 'trespasser'

From: WordNet
noun
Someone who intrudes on the privacy or property of another without permission [syn: intruder, interloper, trespasser]

Definition of 'Trespasser'

From: GCIDE
  • Trespasser \Tres"pass*er\, n. 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. [1913 Webster]