The crossword solution for the term D.C. ADDRESS is SEN, which stands for Senator. A Senator is a member of a senate, which is a deliberative assembly, often the upper house or chamber of a bicameral legislature. In the United States, senators are elected by popular vote to serve six-year terms. Senators represent their states in the U.S. Senate and have the power to introduce legislation, debate, and vote on bills. They also serve as a check on the executive branch by confirming presidential appointments and ratifying treaties.