Thomas Jefferson owned a number of English language dictionaries, including:

• Johnson, Samuel. A Dictionary of the English Language, 4th ed. Dublin: Printed for Thomas Ewing, 1775.
• Walker, John. A Critical Pronouncing Dictionary and Expositor of the English Language. Philadelphia: Budd & Bartram, 1803.
• Webster, Noah. A Compendious Dictionary of the English Language. Hartford and New Haven: From Sidney's Press for Hudson & Goodwin, Booksellers, and Increase Cooke & Co., Booksellers, 1806.

Further Sources

• Sowerby. Volume 5.
• Thomas Jefferson Foundation. Thomas Jefferson Libraries.