Collins COBUILD Advanced Learner's English Dictionary - territorial

1. 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... ADJ: usu ADJ n 2. 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. ADJ