Washingtonian UK /ˌwɒʃɪŋˈtəʊnɪ.ən/US /ˌwɑʃɪŋˈtoʊ.ni.ən/adjective 3noun 3forms 1 adjective3 •Of, or pertaining to, Washington, D.C., or its culture.Good jazz music has long been held up as a hallmark of authentic Washingtonian culture. •Of, or pertaining to, the U.S. state of Washington or its culture.His concern for the cause of environmental protection was very Washingtonian of him. •Of, or pertaining to, the life, values, or presidential administration of George Washington.By appearing in uniform, Jackson was able to convey his strong character through these images. Jackson had seized on one element of the Washingtonian myth and clung to it. — 2005 noun3 •An inhabitant or a resident of Washington, D.C.Many a hardworking Washingtonian have expressed their frustrations at the influx of rich Marylanders moving into their city. •A native or resident of the state of Washington in the United States of America.Any real Washingtonian will be quick to tell you that "Washington state" is a university. •(historical) A member of the Washingtonian movement, a 19th-century sobriety support group. formsWashingtonians