What do we call it when an adjacent property owner gradually takes possession of another's land?

When an adjacent property owner gradually takes possession of another's land, this scenario is referred to as adverse possession, which is typically linked to the concept of encroachment. Encroachment occurs when a property owner extends their use or occupation over a boundary line onto another's property without permission. Over time, if certain legal criteria are met—such as open, continuous, and notorious use—the encroaching property owner may eventually establish legal ownership of that portion of land.

In contrast, color of title refers to a situation where someone has a document that appears to be a valid title but is not legally sufficient. Conveyance involves the act of transferring property from one party to another, and bounds deal with the physical limits or boundaries of a piece of land. Understanding these terms can help clarify the nuances of property rights and how they can be asserted or disputed through encroachment and other legal measures.