ancillary jurisdiction

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Definition

The power of federal courts to hear claims related to the main case even if those claims wouldn't independently qualify for federal court. It's the 'while we're here anyway' principle of judicial efficiency.

Example Usage

The court exercised ancillary jurisdiction over the state law counterclaim because it arose from the same transaction as the federal claim.

Origin

Federal courts doctrine developed in the 20th century

Fun Fact

Ancillary jurisdiction has largely been replaced by the term 'supplemental jurisdiction' under 28 U.S.C. § 1367, but old habits die hard.

Source: Federal jurisdiction and civil procedure

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