territorial
Adjective
This term carries a heavy sense of boundary and ownership. In a biological or animalistic sense, it describes the aggressive instinct to mark and defend a home range to ensure survival and mating rights. When applied to humans, it often takes on a psychological or social tone. It describes a protective, sometimes possessive attitude toward a workspace, a relationship, or a social circle, often implying a lack of openness to outsiders or a fear of encroachment.