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1.
The term 'xenophobia' is typically used to denote a phobic attitude towards foreigners or strangers, or even of the unknown. Racism in general is described as a form of xenophobia.
-"Why do we have to have white people at the front of the bus, and black people at the back of the bus? Why can't we all be green?"

-"Light green at the front of the bus, and dark green at the back please!"
by Mr Munchkins July 17, 2005
 
2.
having a fear or hatred of foreigners; racism
Americans showed a strong feeling of xenophobia during The Red Scare.
by xenophobian June 06, 2006
 
3.
Taken to the extreme, an irrational fear of strangers or more broadly, a fear of those who are different. Taken in a more moderate way, a rational fear of those who are different in some significant way, such as race, ethnicity, culture, politics, religion. Since people live together in families and communities where blood ties and cultural similarities foster cooperation, those who are different undermine this social solidarity. The very presence of people who are different in appearance or belief or language make the majority of people in a community wary of those who do not share a common interest in preserving the dominant group.

This fear is justified since people naturally view those who look, believe, and act in a similar manner as extensions of themselves. Since people are naturally selfish, they will lend aid and befriend those whom they see as similar to themselves. Conversely, since people are naturally selfish and seek to dominate others to enhance their own power, they will naturally first seek to dominate those who are different. People who are different are more likely to be seen as objects rather than fellow humans.

When confronted with these threats to social cooperation based on viewing others as objects, it is rational to foster laws, social and economic policy, and attitudes that preserve one's own kind in power. To do otherwise is to hand power over to those who will destroy one's own way of life, culture, and political system.

Political power as well as cultural and social power are zero-sum games. When one group gains in the same geographical region, other groups must lose.
Campus Leftist: "Oh, those conservatives really show their xenophobia in opposing open immigration. That shows what closed minds they have and how paranoid they are. Of course, we had to shout down a conservative speaker last night at the lecture series, and drive him off campus in order to promote diversity and pluralism. We would never be prejudiced as those conservatives are."
by Tex in Tex February 01, 2008
 
4.
one of humanity's poorer acquisitions;
being scared of multi-ethnicism.
A: "whitepower!"
B, to C: "what's wrong with that poor kid?"
C: "suffering from xenophobia..."
by shizzl May 03, 2005
 
5.
The belief that your country is the best and no other compares.

This is often due to ignorance and stereotypes
Look up ANY country on Urban Dictionary and you will find an example of xenophobia somewhere
by evilhairyhamster July 14, 2006
 
6.
A fear of the evil alien from Scientology.
Scientologist: Xenu is coming. He will destroy you. You must remove the souls from your body so he can't eat you!
Person: Wow, that's a new one. Xenophobic much?
Scientologist: Xenophobia??? Are you a... noof?
by eco April 28, 2008
 
7.
In case one of you persons doesn't understand the complexity of xenophobia, here is a nice, and clear explanation: The complexity of xenophobia, is simple the felt opinion toward foreigners, or unknown persons. In case one of you persons do understand the complexity of xenophobia, don't process xenophobia on foreigners, or the unknown persons in this world. Although, I can say that the way persons today are unknown disappoints me...
Even though we probably didn't need the last part of that definition, xenophobia can be talked about in a quite smart way, as you can see...
by Mike B. Anderson January 03, 2008