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Polarization (Social sciences)
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Political science
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Social groups
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Social influence
¿Polarización en las expectativas democráticas de México ...? 2009.
Dict. of sociology (Oxford), via WWW, July 31, 2009
(polarization: the tendency towards concentration at two opposing extremes; strictly refers to the segregation and opposition of two unequal groups at opposite ends of a distribution of resources)
Concise Oxford dict. of politics, via WWW, July 31, 2009
(polarization: any general move of political actors from centrist to extreme political positions)