Four Hundred

or 400


noun

the exclusive social set of a city or area.

Origin of Four Hundred

An Americanism dating back to 1885–90; allegedly after the capacity of the ballroom in the mansion of Caroline Schermerhorn Astor, a leader of New York society in the late 19th century
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British Dictionary definitions for four hundred

Four Hundred

noun

the Four Hundred US the most exclusive or affluent social clique in a particular place
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012