Webster's Dictionary is any of the English language dictionaries edited in the early 19th century by American lexicographer Noah Webster (17581843), as well as numerous related or unrelated dictionaries that have adopted the Webster's name in honor. "Webster's" has since become a genericized trademark in the United States for English dictionaries, and is widely used in dictionary titles.Merriam-Webster is the corporate heir to Noah Webster's original works, which are in the public domain.

Noah Webster Jr. (October 16, 1758 – May 28, 1843) was an American lexicographer, textbook pioneer, English-language spelling reformer, political writer, editor, and author. He has been called the "Father of American Scholarship and Education". His "Blue-backed Speller" books taught five generations of American children how to spell and read. Webster's name has become synonymous with "dictionary" in the United States, especially the modern Merriam-Webster dictionary that was first published in 1828 as An American Dictionary of the English Language.

Born in West Hartford, Connecticut, Webster graduated from Yale College in 1778. He passed the bar examination after studying law under Oliver Ellsworth and others, but was unable to find work as a lawyer. He found some financial success by opening a private school and writing a series of educational books, including the "Blue-Backed Speller". A strong supporter of the American Revolution and the ratification of the United States Constitution, Webster later criticized American society for being in need of an intellectual foundation. He believed that American nationalism was superior to Europe because American values were superior.In 1793, Alexander Hamilton recruited Webster to move to New York City and become an editor for a Federalist Party newspaper. He became a prolific author, publishing newspaper articles, political essays, and textbooks. He returned to Connecticut in 1798 and served in the Connecticut House of Representatives. Webster founded the Connecticut Society for the Abolition of Slavery in 1791 but later became somewhat disillusioned with the abolitionist movement.In 1806, Webster published his first dictionary, A Compendious Dictionary of the English Language. The following year, he started working on an expanded and comprehensive dictionary, finally publishing it in 1828. He was very influential in popularizing certain spellings in the United States. He was also influential in establishing the Copyright Act of 1831, the first major statutory revision of U.S. copyright law. Whilst working on a second volume of his dictionary, Webster died in 1843, and the rights to the dictionary were acquired by George and Charles Merriam.