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metroplex

noun
met·​ro·​plex | \ˈme‧trōˌpleks\
plural -es

Definition of metroplex 

: a large metropolitan area usually made up of two or more cities along with neighboring heavily populated areas

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First Known Use of metroplex

1956, in the meaning defined above

History and Etymology for metroplex

metro(politan) + -plex

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The first known use of metroplex was in 1956

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