The crossword solution for the term 1 OF 100 IN D.C. is SEN, which stands for Senator. A Senator is a member of the United States Senate, which is one of the two chambers of the United States Congress. Senators are elected by the people of their state and serve for a six-year term. There are currently 100 Senators in the United States Senate, two from each state. The Senators from the District of Columbia are appointed by the President and confirmed by the Senate.