IPA: /nɒnˈpeɪpəl/
KK: /nɑnˈpeɪpəl/
Not related to the Pope or the papacy.
The nonpapal authority in the church made decisions independently of the Pope.
Nonpapal → It is formed from "non-" (meaning not) and "papal" (from Latin "papa", meaning pope). The word "nonpapal" refers to something that is not related to or associated with the pope.
Think of 'non-' meaning 'not' and 'papal' relating to the pope — so nonpapal means not related to the pope.