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From The Collaborative International Dictionary of English v.0.48:
Jeffersonian \Jef`fer*so"ni*an\, a. Pertaining to, or characteristic of, Thomas Jefferson (third President of the United States) or his political doctrines, which were those of the Republicanism of his time, as opposed to those of the Federalists. -- n. An adherent of Jefferson or his doctrines. -- Jef`fer*so"ni*an*ism, n. [Webster 1913 Suppl.]