Definitions for jeffersonˈdʒɛf ər sən
Random House Webster's College Dictionary
Jef•fer•sonˈdʒɛf ər sən(n.)
Thomas, 1743–1826, 3rd president of the U.S. 1801–09.
Jefferson, Thomas Jefferson, President Jefferson(noun)
3rd President of the United States; chief drafter of the Declaration of Independence; made the Louisiana Purchase in 1803 and sent out the Lewis and Clark Expedition to explore it (1743-1826)
A two-dollar bill.
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.