Definition of the Eastern Establishment from the Oxford Advanced Learner's Dictionary

 

the Eastern Establishment

 
BrE
 
; NAmE
 
(sometimes disapproving)
 
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the people and institutions in the north-eastern US that have traditionally had great economic and political power in the country. These include the old, rich families in cities like Boston, Philadelphia and New York, and institutions like the Ivy League and the New York Stock Exchange.