Adjective
(US) Within the portions of Washington D.C., Maryland and Virginia encircled by Interstate 495. (The Washington Beltway)
(US) Of or relating to things that occur in Washington, D.C., usually in relation to United States national politics.
(US) Out of touch with sentiments of persons living outside of Washington, D.C.
(New Zealand) Of or relating to New Zealand politics in the capital city of Wellington, New Zealand.
Source: en.wiktionary.org