Yes. The party who files the appeal is the appellant; the opposing party is the appellee. Today, the more common terms are petitioner (appellant) and respondent (appellee).

The cross appeal rule states that a remedy in favor of an appellee can only be justified if the appellee brings a cross appeal.

In Greenlaw v. United States, the Supreme Court held that an appellate court violated this rule when it imposed a minimum sentencing hike on the appellant even though the appellee (state) had not filed a cross appeal.

The party who appeals a decision is called the appellant. The opposing party or respondent in a decision who didn't appeal is called the appellee.

In an Appeals Court, an appellant, otherwise known as the petitioner will be in the courtroom. The respondent, also known as an appellee will also be in the courtroom. There will also be attorneys and appeal court judges.