The word Terran refers to anything attributed to the planet Earth (Latin: Terra) or Humans.
The term has been used to identify many items attributed to Earth:
- The "Terran solar system" and "Terran system" are alternate names for the Sol system which contains Earth. (Star Trek IV: The Voyage Home; TNG: "The Best of Both Worlds")
- A Terran leech is separate from other leeches. (TNG: "Phantasms")
- According to material created for, but not seen in Star Trek Generations, the Terran Winemakers Association was an Earth-based wine-judging organization.
The term also referred to items attributed to Humans:
- The SS Mariposa used a Terran distress beacon created by the European Hegemony. (TNG: "Up the Long Ladder")
- "Terran" was used explicitly to refer to a Human (St. John Talbot) by Sybok and Vixis in 2287. (Star Trek V: The Final Frontier)
- This was the only time a normal universe Human was referred to as a "Terran."
- Data referred to Terran conjugal rites. (Star Trek Nemesis)
- Shinzon saw a Romulan doctor who had experience in Terran illnesses. (Star Trek Nemesis)
Mirror Universe
In the mirror universe, Terran was synonymous with Human. (DS9: "Crossover") Terran would later be used to refer to Humans from the mirror universe. (DS9: "Resurrection")