Legal Definition of vested. 1  1 : fully and absolutely established as a right, benefit, or privilege : not dependent on any contingency or condition; specifically : not subject to forfeiture if employment terminates before retirement vested pension benefits. 2  2 : having a vested interest a vested employee a vested beneficiary.
Thomas Jefferson was the President when the Louisiana Purchase  transaction was negotiated. The people who actually signed the  Purchase Treaty were James Monroe, Robert Liv â¦ ingston, and Barbe  Marbois.
Further Sources. 1  Bond, Bradley G., ed. French Colonial Louisiana and the Atlantic World. 2  Cunningham, Noble, Jr. Jefferson and Monroe: Constant Friendship and Respect. 3  Fleming, Thomas J. The Louisiana Purchase. Hoboken, NJ: John Wiley & Sons, 2003. 4  Lewis, James E., Jr. Louisiana Purchase: Jefferson's Noble Bargain. 5  Rodriquez, Junius P., ed.