This word can have two interpretations, and this taking 'alien' only in its sense of 'extraterrestrial entity'. First of all, it can be a hobby or sympathy for everything related to alleged aliens, UFOs and similar topics. And lastly, it would be a paraphilia whereby you feel a sexual arousal with a xenomorph cosplay or watching hentai about creatures from other planets. See English/alien, -philia.
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