What is the definition of Communion?
Communion refers to two things. First it refers to the unity of faith of Catholics. If someone is in “communion” with the Catholic Church, that means they are baptized in the Church, or have been received into the Church, uphold all the doctrines of the faith, and are not separated from her through schism (i.e. outward rejection of church authority, such as her bishops).(CCC. 949). Secondly, and more commonly, it refers to the sacrament of the Eucharist. (CCC 1331).