noun

• (countable) An English surname originating as a patronymic; (US politics) used specifically of Thomas Jefferson (1743–1826), the third president of the United States, principal author of the US Declaration of Independence (1776), and one of the most influential founders of the United States.
• (countable) A male given name transferred from the surname.
• A place in the United States:
• An unincorporated community in Marengo County, Alabama.
• An unincorporated community in Jefferson County, Arkansas.
• An unincorporated community in Park County, Colorado.
• A city, the county seat of Jackson County, Georgia.
• An unincorporated community in Washington Township, Clinton County, Indiana.
• A city, the county seat of Greene County, Iowa.
• An unincorporated community in Montgomery County, Kansas.
• A census-designated place in Jefferson Parish, Louisiana.
• A town in Lincoln County, Maine.
• A census-designated place in Frederick County, Maryland.
• A village in Holden, Worcester County, Massachusetts.
• An unincorporated community in Jefferson Township, Houston County, Minnesota.
• A town in Coos County, New Hampshire.
• A town and census-designated place therein, in Schoharie County, New York.
• A town, the county seat of Ashe County, North Carolina.
• A village, the county seat of Ashtabula County, Ohio.
• A small town in Grant County, Oklahoma.
• A city in Marion County, Oregon.
• A borough in Greene County, Pennsylvania.
• A borough in York County, Pennsylvania.
• A town in Chesterfield County, South Carolina.
• A minor city in Union County, South Dakota.
• A city, the county seat of Marion County, Texas.
• A census-designated place in Kanawha County, West Virginia.
• A town in Green County, Wisconsin.
• A city, the county seat of Jefferson County, Wisconsin.
• A town in Jefferson County, Wisconsin, the city is partially within it.
• A town in Monroe County, Wisconsin.
• A town in Vernon County, Wisconsin.
• A number of townships in the United States, listed under Jefferson Township.
• A community in Cardston County, Alberta, Canada.
• (slang, US) A two-dollar bill.
• Ellipsis of Jefferson Parish. [One of 64 parishes in Louisiana, United States, the equivalent of a county in other US states.. Parish seat: Gretna.]
• Ellipsis of Jefferson County. [A county of Alabama, United States. County seat: Birmingham.]
• Ellipsis of Jefferson City. [The capital city of Missouri, United States, and the county seat of Cole County.]