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A principle which dictates that in any given group of people, the most attractive person will be regarded as extremely hot, irregardless of that person's actual attractiveness.

The effect is most often seen with groups of "less than" to "not-at-all" attractive people.
"Damn, Lucy is looking fine!"
"No way, man, look around -- Xander Effect."
by James Carmel April 20, 2006
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