Definition of "Washingtonian" :

noun: a native or resident of the state of Washington

noun: a native or resident of the city of Washington

adjective: of or relating to or in the state of Washington

adjective: of or relating to the capital of the United States

"Washingtonian museums."

adjective: of or relating to the people who run the federal government

"Washingtonian politics as usual."

adjective: of or relating to or in the manner of George Washington