Appellee

The party against whom an appeal is filed.  The appellee usually seeks affirmance of the lower court's decision.  By contrast, the appellant is the party who filed the appeal.

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

See Appellate Procedure.