"Alien" refers to any being that is foreign to one's own homeworld. The term can be used affectionately or as xenophobic slang.

Prior to their identification, the Takret were called "alien" by T'Pol. (ENT: "The Catwalk")

The 22nd century inhabitants of Earth referred to the Borg as aliens, as the species was unknown at the time. (ENT: "Regeneration")

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Background information Edit

According to the TNG Season 1 Writers'/Directors' Guide, the term "alien" was defined as "not Human. Different. Not of our tribe. An alien being is any life form not native to Earth."

In the first draft script of ENT: "Fusion" (which had the working title "Equilibrium"), Trip Tucker mentioned to Fraht that, for Halloween during Trip's childhood, he had usually dressed up as either an alien or an astronaut. Fraht, having been wondering what to wear for an upcoming Halloween party aboard Enterprise NX-01, reasoned that, among Humans, he actually was an alien, so Tucker advised him to attend the party just as he was.

A deleted scene from TOS: "Return to Tomorrow" had Spock compare sharing his consciousness with Christine Chapel, a woman, to being in the mind of an alien. Ann Mulhall, amused, then referred to Chapel as her fellow alien (female). (Star Trek: Lost Scenes)

Behind the scenes of Star Trek Into Darkness, the alternative term "visitor" was used for non-Humans. [1]