1. Of or relating to the geographic area under a given jurisdiction: the territorial limits of a country.

2. Relating or restricted to a particular territory; regional: a territorial court.

3. often Territorial Of or relating to an administrative territory: the territorial government of the US Virgin Islands; Whitehorse, the territorial capital of the Yukon.

4. often Territorial Organized for national or home defense: the British Territorial Army.

5. Biology Displaying territoriality; defending a territory from intruders: territorial behavior; a territorial species.