Definitions

1. noun

A person who has been elected or proclaimed as pope but whose claim is not accepted by the Catholic Church or who is considered illegitimate by the Catholic Church.

“The antipope was eventually excommunicated by the official papacy.”

2. noun

A person who opposes the authority or actions of the Pope or the Catholic Church.

“The politician was accused of being an antipope by his opponents due to his views on the Catholic Church.”