IPA: /ˌɪntəˈkəʊmjʊn/
KK: /ˌɪntərkəˈmjunɪən/
A close relationship or connection between people or groups, often involving shared beliefs or practices, especially in a religious context.
The intercommunion between the two churches allowed their members to participate in each other's services.
Intercommunion → It is formed from "inter-" (meaning between) and "communio" (from Latin, meaning sharing or communion). The word refers to the act of sharing or participating in communion between different groups or denominations.
Think of 'sharing' ('communio') that happens 'between' ('inter-') different groups — that's what intercommunion means.