The party who appeals a lower court's decision in a higher court.  The appellant seeks reversal or modification of the decision. By contrast, the [[wex:appellee]] is the party against whom the appeal is filed.

Suppose P sues D, and wins.  D files an appeal.  D is the appellant, and P is the [[wex:appellee]].  If D wins the appeal, and P appeals, the roles are reversed.  P becomes the appellant and D is the [[wex:appellee]].

See [[wex:appellate_procedure|Appellate Procedure]].