Dictionary.net

• 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

2006 - WordNet 3.0
By Princeton University

• 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

2011 - English Dictionary Database
By DataStellar Co., Ltd