territorial has 1 distinct synonym spread across 1 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are nonterritorial, extraterritorial.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
displaying territoriality; defending a territory from intruders
“territorial behavior”
belonging to the territory of any state or ruler
“territorial rights”
nonprofessional soldier member of a territorial military unit
a territorial military unit
1 of the 5 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for territorial.
Synonyms, antonyms and the broader and narrower relations for territorial come from Princeton University’s WordNet. Full sources and licences.