Definition - What does En Banc mean?
En banc is a Latin word that means “in the bench.” It refers to situations where a number of different judges will sit “in the bench.” This can happen when a case is particularly complex or important. Commonly, when judges sit en banc, the whole court will be involved with the decision of the case instead of just the standard usual number of judges.
Justipedia explains En Banc
Certain court cases are fairly simple and can be handled by just one judge or by a panel of judges. However, some cases are much more complex or important. Due to the increasing complexity or significance of the issues, the court prefers to use a larger number of judges to oversee the proceedings and weigh in on the decision. By having many judges “en banc,” it prevents just one or a small number of judges from having shoulder the full burden