For the mirror universe counterpart, see Terran (mirror).

Terran is a common adjective describing an origin or association with Earth, the homeworld of the Human species. The term is derived from terra, the word for Earth in the Human language Latin.

Before the founding of the Federation Earth Starfleet officers including Jonathan Archer referred to the system by its native Earth name as the Sol System

In the prime universe, the term is still encountered on occasion, although it is considered archaic. The USS Saratoga patrolled the Terran system before encountering the Cetacean probe in 2286. (TOS movie: Star Trek IV: The Voyage Home)

During the Borg Invasion of 2367 when approaching Earth Data referred to the system as the Terran System.

In Klingon, a similar term, tera', means Earth. The nouns Human and Terran are translated as Human and tera'ngan, respectively. (tlhIngan Hol reference: The Klingon Dictionary)