Definition of Seton, St. Elizabeth Ann
- (1774–1821), US religious leader, educator, and social reformer; full name St. Elizabeth Ann Bayley Seton. The widowed mother of five children, she converted to Roman Catholicism in 1805. She became a nun in 1809 and by 1813 had founded the Sisters of Charity, a religious order. In 1975, she became the first native-born American to be canonized.