Dictionary.net

• a hill in Washington, D.C., where the capitol building sits and Congress meets; "they are debating the budget today on Capital Hill"

2006 - WordNet 3.0
By Princeton University

• a hill in Washington, D.C., where the capitol building sits and Congress meets; "they are debating the budget today on Capital Hill"

2011 - English Dictionary Database
By DataStellar Co., Ltd