federal district - a district set apart as the seat of government of a federation

U.S.A., United States, United States of America, US, USA, America, U.S. - North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776

American capital, capital of the United States, Washington, Washington D.C. - the capital of the United States in the District of Columbia and a tourist mecca; George Washington commissioned Charles l'Enfant to lay out the city in 1791