Source : Webster's Revised Unabridged Dictionary (1913)

Washingtonian \Wash`ing*to"ni*an\, a.
   1. Pertaining to, or characteristic of, George Washington;
      as, a Washingtonian policy. --Lowell.

   2. Designating, or pertaining to, a temperance society and
      movement started in Baltimore in 1840 on the principle of
      total abstinence. -- n. A member of the Washingtonian
      Society.

Source : WordNet®

Washingtonian
     adj 1: of or relating to or in the manner of George Washington
     2: of or relating to the people who run the federal government;
        "Washingtonian politics as usual"
     3: of or relating to the capital of the United States;
        "Washingtonian museums"
     4: of or relating to or in the state of Washington
     n 1: a resident of the city of Washington
     2: a resident of the state of Washington