The first hypothesis on what we now name "aliens" dates back to the atomist ideas popular among Epicurean philosophers and their Roman students in ancient Greece.
More explanation about the above is given as:
Democritus and Epicurus thought the cosmos was the product of a random collision of atoms and thought it was extremely likely that there were other worlds out there that were inhabited.
Metrodorus of Chios, Epicurus' follower, thought the concept of our "world" being the sole one as implausible as "if a single ear of wheat grew on a huge plain."
As the Roman Epicurean poet - Lucretius put it, "nothing in the cosmos is unique and alone, hence there must be other earths inhabited by various tribes of men and kinds of creatures in other locations."
What the definition of Alien in this context?
In this context, an alien is another form of life that is currently unavailable on planet Earth and didn't originate form same either naturally or by biological or genetic synthesis.
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