Supplemental jurisdiction

: jurisdiction granted federal courts over claims that could not be heard in a federal court on their own but that are so closely related to claims over which the court has original jurisdiction that they form part of the same case
see also ancillary jurisdiction and pendent jurisdiction in this entry
Supplemental jurisdiction was created by a federal statute that codified the judicially created doctrines of ancillary and pendent jurisdiction.
2  : the authority (as of a state) to govern or legislate <the trade bill was within the Ways and Means committee's ~> <whether a foreign state shall be subject to the ~ of another>
: the power or right to exercise authority <the department of consumer affairs has ~ over such complaints>
3  : the limits or territory within which authority may be exercised <no new State shall be formed or erected within the ~ of any other State ­U.S. Constitution art. IV>

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Based on Merriam-Webster's Dictionary of Law ©2001.
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