What is the meaning of Alien?

A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration.

A person in a country not their own.

Any life form of extraterrestrial or extradimensional origin.

One excluded from certain privileges; one alienated or estranged.

Not belonging to the same country, land, or government, or to the citizens or subjects thereof; foreign.

Very unfamiliar, strange, or removed.

Pertaining to extraterrestrial life; typical of an extraterrestrial creature.

To estrange; to alienate.

To transfer the ownership of something.

third-person plural present indicative of aliar

An alien, an extraterrestrial.

alien, extraterrestial (extraterrestrial creature, especially a dangerous one)

alien (extraterrestrial)

An outsider or foreign person, especially if resident in one's nation.

One who is alien in some other way (e.g. religion, family)

An unlawful occupier or possessor of land.

Outside, alien, foreign; from or relating to another nation.

Religiously outside; heretical, erring; of false religion or morals.

Distant, isolated, secure, away (from something)

Under the authority of other nation's religious institutions.

Not relating to or of oneself; not natural (to one's body).

Bizarre, weird, exotic.

Alternative form of allien

alien; foreign; non-native

alien (a non-native)

alien; extraterrestrial life form

Source: wiktionary.org