What is the meaning of encroachment?

encroachment is an unauthorized invasion or intrusion of an improvement or other real property onto another's property, thus reducing the size and value of the invaded property. Common examples of encroachments are the roof of a building that extends over the (See easement, encroachment, judgment, lien, mechanics' lien, mortgage) property line or the front of a building that extends over the building setback line or extends onto a neighbor's property.