Definition: Meaning of, Jefferson, Thomas in English to English dictionary.
Pronunciation:/ ˈdʒɛfəs(ə)n /
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(1743-1826) the third President of the US, from 1801 to 1809. Jefferson was an important member of the CONTINENTAL CONGRESS and wrote most of the DECLARATION OF INDEPENDENCE . When he was president, the US bought the LOUISIANA PURCHASE, and the slave trade officially stopped being legal.