IPA: /əˈpɛlət/
KK: /əˈpɛlət/
Relating to a court that has the authority to review and change the decisions made by lower courts.
The appellate court overturned the previous ruling due to a legal error.
Appellate is formed from "appellare" (meaning to call upon or appeal) and the suffix "-ate" (indicating a state or condition). The word refers to a court that has the authority to hear appeals from lower courts, thus calling upon a higher authority for a decision.
Think of 'calling upon' ('appellare') a higher court to review a decision — that's what appellate means.