What does Xeno mean?

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What does Xeno mean?I've been playing Galciv 2 for a year and i want to know what Xeno means.
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Reply #1 from GalCiv2 Forums Top
Xenos (Greek) 'Stranger'.

Xenobiology - biology concerning foreign (in this case alien) biology.
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Reply #3 from GalCiv2 Forums Top
Xenocide-an act of genocide against an alien species, especially through warfare.
Reply #4 from GalCiv2 Forums Top
pretty good definition, from Wikipedia:

"Xeno" is a prefix based on the Greek word "Xenos", meaning stranger.

-- thus the reference to foreign or alien...