IPA: /ˌɪntəˈpærəʊkɪəl/
KK: /ɪnˌtɜr.pəˈroʊ.ki.əl/
Relating to or occurring between different parishes, which are local church communities.
The interparochial meeting brought together leaders from several local churches to discuss community issues.
Interparochial → It is formed from "inter-" (meaning between) and "parochialis" (from Latin "parochia", meaning parish). The word describes something that occurs between or among different parishes.
Think of things happening 'between' ('inter-') different 'parishes' ('parochialis') — that's what interparochial means.