English
antialien
From anti- + alien.
Proto-Indo-European *h₂ent- ‘forehead’
Proto-Indo-European *h₂énts ‘forehead’
Proto-Indo-European *h₂énti ‘opposite’
Ancient Greek ᾰ̓ντῐ́ ‘over against, opposite’
English anti-
Proto-Indo-European *h₂el- ‘beyond, other’
…
Latin alius ‘other’
Latin aliēnus ‘belonging to someone else”, later “exotic,…’
Old French alien
Middle English alien ‘an outsider or foreign person, especially if…’
English alien
Today it means
adj Opposing aliens or foreigners.
Language periods are conventional ranges, not dates for this word.
Etymograph / antialien