The courts
en banc
All active judges of an appeals court rehearing a case together, rather than the usual three-judge panel. Used for exceptionally important questions or to fix panel conflicts.
In full
Circuit courts normally sit in randomly drawn panels of three, and one panel's published decision binds later panels. When a question is important enough, or panels conflict, a majority of the circuit's active judges can vote to rehear the case en banc, and the full court's decision displaces the panel's.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.