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Definition of alien : 1. A foreigner; one owing allegiance, or belonging, to another country; a foreign- born resident of a country in which he does not possess the privileges of a citizen. Hence, a stranger. See Alienage.
2. Not belonging to the same country, land, or government, or to the citizens or subjects thereof; foreign; as, alien subjects, enemies, property, shores.
3. One excluded from certain privileges; one alienated or estranged; as, aliens from God's mercies.
4. To alienate; to estrange; to transfer, as property or ownership.
5. Wholly different in nature; foreign; adverse; inconsistent ( with); incongruous; - followed by from or sometimes by to; as, principles alien from our religion.

Synonyms:

unknown, cyberpunk, accidental, opposed, overseas, unknown region, cyborg, repugnant, odd, extraterrestrial being, outsider, newcomer, different, surprising, disaffect, adventitious, offbeat, notable, noncitizen, nonnative, gaijin, supervenient, terra incognita, dissimilar, ET, remarkable, unknown quantity, study at, alienate, native, beam down, beam up, MiGr, unusual, unique, estrange, out of the ordinary, android, earthling, special

aeronaut (part of speech: noun)

astronaut, airman, copilot, balloonist, flier, cosmonaut, rocketeer, Martian, astro-navigator, aviator, passenger, spaceman, aeronaut, captain, pilot

foreigner (part of speech: noun)

immigrant, migrant, foreigner, expatriate, outlander, stranger, refugee

unrelated (part of speech: adjective)

disenfranchised, remote

extraneous (part of speech: adjective)

foreign, inappropriate, inadmissible, outer, extraterrestrial, eerie, nonessential, exotic, estranged, separated, foreign-born, extrinsic, disjoint, outlandish, strange, unaffiliated, immaterial, other, detached, impertinent, disaffiliated, parenthetical, outside, removed, segregated, inapplicable, separate, external, unessential, unallied, dissociated, extraneous, irrelevant, unrelated, disconnected

Usage examples: