The word 'territorial' originates from the Latin noun territorium, which denoted the land surrounding a town or a district under jurisdiction. This noun was built from terra (earth, land) and the suffix -orium, used to form nouns indicating a place. The English adjective was formed in the early 17th century by appending the relational suffix -al to the noun 'territory'. Thus, the literal construction "of or pertaining to a territory" evolved from the concrete concept of bounded land to encompass both legal control over an area and the protective, possessive behavior associated with defending one's domain.

Structure: territ (land) + ori (noun suffix) + al (adjective suffix) - territ: From Latin territorium (land around a town, domain), itself from terra (earth, land). It functions as the core root conveying the sense of land or domain. - ori: A Latin noun-forming suffix (often -orium) indicating a place or thing related to the action of the root. In this structure, it is part of the noun base "territori-" (territory). - al: An adjectival suffix from Latin -alis, meaning "of, relating to, or characterized by." It converts the noun base into an adjective.