Communicatio in sacris

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In the Catholic Church, communicatio in sacris ("communion in sacred [things]"; also translated as "worship in common"^: n.8), also called communicatio in divinis ("communion in divine [things]") or communicatio in ritibus ("communion in rites"), designates the regulations for the partaking of a Catholic person to a non-Catholic sacrament or liturgical celebration, or for the partaking of a non-Catholic person to a Catholic sacrament or liturgical celebration. The expression is also used to refer to said acts of partaking themselves.

Communicatio in sacris is legislated mainly by two canons: canon 844 of the 1983 Code of Canon Law, and canon 671 of the Code of Canons of the Eastern Churches.