[eyl-yuhn, ey-lee-uhn]
a resident born in or belonging to another country who has not acquired citizenship by naturalization (distinguished from citizen ).
a foreigner.
a person who has been estranged or excluded.
a creature from outer space; extraterrestrial.
residing under a government or in a country other than that of one's birth without having or obtaining the status of citizenship there.
belonging or relating to aliens: alien property.
unlike one's own; strange; not belonging to one: alien speech.
adverse; hostile; opposed (usually followed by to or from ): ideas alien to modern thinking.

1300–50; Middle English < Middle French < Latin aliēnus, equivalent to *alies- (ali-, base of alius other + -es- noun suffix) + -nus adj. suffix

nonalien, noun, adjective
proalien, adjective

1. immigrant. 2. See stranger. 3. outcast. 7. exotic, foreign. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alien (ˈeɪljən, ˈeɪlɪən)
1.  a person owing allegiance to a country other than that in which he lives; foreigner
2.  any being or thing foreign to the environment in which it now exists
3.  (in science fiction) a being from another world, sometimes specifically an extraterrestrial
adj (and foll by to)
4.  unnaturalized; foreign
5.  having foreign allegiance: alien territory
6.  unfamiliar; strange: an alien quality in a work of art
7.  repugnant or opposed (to): war is alien to his philosophy
8.  (in science fiction) of or from another world
9.  rare (tr) to transfer (property, etc) to another
[C14: from Latin aliēnus foreign, from alius other]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-14c., "strange, foreign," from O.Fr. alien, from L. alienus "of or belonging to another," adj. form of alius "(an)other" (see alias). Meaning "of another planet" first recorded 1944 in science fiction writing; the noun in this sense is from 1953. The noun sense of "foreigner"
is first attested early 14c. An alien priory (c.1500) is one owing obedience to a mother abbey in a foreign country.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
alien  [%PREMIUM_LINK%]     (ā'lē-ən)  Pronunciation Key 
Introduced to a region deliberately or accidentally by humans. Starlings, German cockroaches, and dandelions are species that are alien to North America but have become widely naturalized in the continent. Compare endemic, indigenous.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Bible Dictionary

Alien definition

a foreigner, or person born in another country, and therefore not entitled to the rights and privileges of the country where he resides. Among the Hebrews there were two classes of aliens. (1.) Those who were strangers generally, and who owned no landed property. (2.) Strangers dwelling in another country without being naturalized (Lev. 22:10; Ps. 39:12). Both of these classes were to enjoy, under certain conditions, the same rights as other citizens (Lev. 19:33, 34; Deut. 10:19). They might be naturalized and permitted to enter into the congregation of the Lord by submitting to circumcision and abandoning idolatry (Deut. 23:3-8). This term is used (Eph. 2:12) to denote persons who have no interest in Christ.

Easton's 1897 Bible Dictionary
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Example sentences
Since the 1960s attempts have been made to do so by sifting through signals
  from outer space in search of alien chit-chat.
This was an alien, arctic world I had entered.
He explained that the suburban world depicted in those shows was alien to the
  life he saw outside his tenement window.
From alien-looking baby starfish to snowflake-like crabs, some of the ocean's
  smallest life-forms have been revealed.
Matching Quote
"I am the LORD your God, who brought you out of the land of Egypt, out of the house of slavery; you shall have no other gods before me.
You shall not make for yourself an idol, whether in the form of anything that is in heaven above, or that is on the earth beneath, or that is in the water under the earth. You shall not bow down to them or worship them; for I the LORD your God am a jealous God, punishing children for the iniquity of parents, to the third and the fourth generation of those who reject me, but showing steadfast love to the thousandth generation of those who love me and keep my commandments.
You shall not make wrongful use of the name of the LORD your God, for the LORD will not acquit anyone who misuses his name.
Remember the sabbath day, and keep it holy. Six days you shall labor and do all your work. But the seventh day is a sabbath to the LORD your God; you shall not do any work -you, your son or your daughter, your male or female slave, your livestock, or the alien resident in your towns. For in six days the LORD made heaven and earth, the sea, and all that is in them, but rested the seventh day; therefore the LORD blessed the sabbath day and consecrated it.
Honor your father and your mother, so that your days may be long in the land that the LORD your God is giving you.
You shall not murder.
You shall not commit adultery.
You shall not steal.
You shall not bear false witness against your neighbor.
You shall not covet your neighbor's house; you shall not covet your neighbor's wife, or male or female slave, or ox, or donkey, or anything that belongs to your neighbor."
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