(1):

(a.) Not belonging to the same country, land, or government, or to the citizens or subjects thereof; foreign; as, alien subjects, enemies, property, shores.

(2):

(n.) 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.

(3):

(v. t.) To alienate; to estrange; to transfer, as property or ownership.

(4):

(n.) One excluded from certain privileges; one alienated or estranged; as, aliens from God's mercies.

(5):

(a.) Wholly different in nature; foreign; adverse; inconsistent (with); incongruous; - followed by from or sometimes by to; as, principles alien from our religion.