term:

Squatter

squatter n

: a person who occupies real property without a claim of right or title NOTE: In most jurisdictions, a squatter cannot gain title to land through adverse possession because adverse possession requires possession of the property under a claim of right or color of title.

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.