The middle of the East Coast of the United States, typically consisting of New York, New Jersey, Pennsylvania, Maryland, Delaware, Virginia, West Virginia, and Washington, DC. / Used alone, with "the".

Of or relating to this region.

a mostly underwater mountain range on the ocean floor of the Atlantic Ocean about midway between Afro-Eurasia and the Americas; includes Iceland, the Azores, Ascension, St. Helena, Tristan da Cunha and other islands