If you describe an animal or its behaviour as territorial, you mean that it has an area which it regards as its own, and which it defends when other animals try to enter it. Two cats or more in one house will also exhibit territorial behaviour
a territorial military unit nonprofessional soldier member of a territorial military unit of or relating to the local vicinity; "territorial waters" displaying territoriality; defending a territory from intruders; "territorial behavior"; "strongly territorial birds" of or relating to a territory; "the territorial government of the Virgin Islands"; "territorial claims made by a country
Referring to an animal that maintains a territory within its home range, by fighting or aggressive gestures, from which it excludes others of its own kind
Territorial means concerned with the ownership of a particular area of land or water. It is the only republic which has no territorial disputes with the others