There are multiple definitions - click on the translation that matches your context.

apelacja

rzeczownik

full

challenge

noun

Definitions of challenge

an appeal (=the action of asking a higher court to review and change the decision of a lower court)

He said the campaign would lodge a challenge with the Constitutional Court.

the action of not accepting someone or something's authority; the action of trying to replace someone or something in a position of authority

The issue of a leadership challenge made an immediate return to the top of the political agenda.

the action of questioning whether something is legal, correct, accurate, or true etc

It represented a challenge to these commonly held beliefs.