The word 'territory' entered English in the fifteenth century from Latin 'territōrium,' meaning the land belonging to or surrounding a town. The standard etymology derives it from 'terra' (earth, land, ground) with the locative suffix '-tōrium,' making territory literally 'a place of land' — a defined tract of earth.
The Latin 'terra' comes from PIE *ters- (to dry), a root that also produced 'thirst' (the condition of being dry), 'toast' (bread dried by heat), and 'torrid' (dried out by heat). The connection between 'earth' and 'dryness' reflects a fundamental perception: the habitable surface is the dry land, as opposed to the sea, the marshes, and the rivers. Terra is where you can stand, build, and farm — precisely because it is dry.
The alternative etymology, proposed by the Roman jurist Pomponius in the second century CE, derived 'territōrium' from 'terrēre' (to frighten) — making territory 'land from which people are frightened off,' land defended by the threat of force. Modern linguists generally reject this as folk etymology, but it contains an accidental truth. Territories, whether political or biological, are defined by defense. A state's territory is the land it can defend. An animal's territory is the area it can patrol and protect from rivals. The 'frighten' etymology, though historically incorrect, captures the functional reality
In political geography, 'territory' has both general and specific senses. Generally, it means any area of land under a government's control. Specifically, in the American context, a 'territory' is a region governed by the federal government that has not yet been admitted as a state — as in the Northwest Territory, the Oregon Territory, or the current territories of Puerto Rico, Guam, and the U.S. Virgin Islands. This specific usage dates to the Northwest Ordinance of 1787.
In animal behavior, 'territorial' describes species that defend fixed areas against intruders of the same species. Birds sing to mark their territories. Wolves urinate on boundary markers. Fish chase rivals from their patches of reef. The ethological study of territoriality, pioneered by Konrad Lorenz and Niko Tinbergen in the mid-twentieth century, revealed that territorial behavior follows predictable rules
The word family from Latin 'terra' is large and diverse. 'Terrain' (the physical character of land), 'terrestrial' (of the earth), 'terrace' (a leveled area of ground), 'Mediterranean' (the middle of the earth/land), 'subterranean' (under the earth), 'terra cotta' (cooked earth — fired clay), 'terra firma' (solid ground), 'terra incognita' (unknown land), 'terrier' (a dog that digs into the earth after burrowing animals), and 'inter' (to put into the earth — to bury) all come from 'terra.'
The phrase 'comes with the territory' — meaning an inevitable accompaniment of a particular situation — dates from mid-twentieth-century American English, originally from sales jargon. Each salesperson was assigned a territory; the difficulties of that territory were inseparable from the opportunity. The phrase has since generalized to mean any unavoidable consequence of a chosen path.