Trespasser (noun)

A person who enters another's property without permission or right.

Origin:

Late middle english (denoting a wanderer or traveler): from old french, from tres- "beyond" + passer "to pass".

Examples:

1. The property owner called the police to report a trespasser who was camping on his land.
2. The security guard was trained to deal with potential trespassers and knew how to escort them off the premises.
3. Trespassers are not welcome on this private property and will be prosecuted to the fullest extent of the law.
4. The park ranger warned the hikers that they were entering private property and could be considered trespassers.
5. The homeowner was shocked to find a stranger in his house and quickly called the police to report a trespasser.