Accroachment is a term used to describe the gradual intruding or encroachment upon someone's land, property, rights, or space. There are several synonyms for this term, including encroachment, invasion, infringement, impingement, violation, trespass, and encroachment. Encroachment usually refers to the physical or spatial occupation of an area or land by an outside party. Invasion and infringement are more aggressive terms, suggesting a concerted effort to take over or violate someone's space. Impingement and violation suggest a violation or breach of rules or laws, often in relation to property or rights. Trespass and encroachment are more informal terms, suggesting an unauthorized or unwanted presence.