The possession of land, without legal title, for a period of time sufficient to become recognized as legal owner. The more common word for this is "squatters." Each state has its own period of time after which a squatter can acquire legal title. Some states prohibit title by mere prescription or possession.
ADVERSE POSSESSION
Meaning of ADVERSE POSSESSION in English
Duhaime's Law English dictionary. Английский юридический словарь Duhaime . 2012