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

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

In our universe; it is sometimes still common vernacular, although archaic. USS Saratoga patrolled the Terran solar system, before encountering the Whalesong probe, in 2286. (TOS movie: Star Trek IV: The Voyage Home)

The Klingon word for this is terra 'Gnan. (TOS movie: Star Trek V: The Final Frontier)