# Intercommunion ## Catechism of the Catholic Church Participation or sharing in the reception of the Eucharist or Holy Communion by Christians who are not fully united to or in full communion with the Catholic Church ([[2.2.1.3.p42#^ccc-1398|1398]]). ## Vatican II - intercommunion (communicatio in sacris) — "Common participation in worship (communicatio in sacris) which harms the unity of the Church or involves formal acceptance of error" — [[orientalium-ecclesiarium#^oe-26|OE ¶26–29]] - intercommunion (communicatio in sacris) — "some worship in common (communicatio in sacris), given suitable circumstances and the approval of Church authority, is not only possible" — [[unitatis-redintegratio#^ur-8|UR ¶8, ¶15]]