intercommunion

noun

1. (countable, uncountable)communion (association) between people or groups
2. (countable, uncountable)The participation, together, in Holy Communion of people from different denominations
3. (countable, uncountable)In Roman Catholicism, the theological principle which governs whether it is permissible for a Roman Catholic to partake of the Eucharist in a non-Catholic service, and vice versa