A request made after a trial by a party that has lost on one or more issues that a higher court review the decision to determine if it was correct. To make such a request is "to appeal" or "to take an appeal." One who appeals is called the "appellant;" the other party is the "appellee."
A proceeding, taken by a party to a case who is dissatisfied with a decision made, to a court having authority to review or set aside that decision.
An application to a senior court to change a decision of a lower court or tribunal.