The American Church Dictionary and Cycopedia
Communion of Saints
An article of the Creed by which is meant the fellowship with, or union in Christ of all who are one with Him whether they are among the living in the Church on earth or the departed in Paradise. The Communion of Saints is specially realized in the Holy Eucharist. This spiritual food is our Lord's own divine substance and life, by participation in which the faithful Christian enters into a communion with his Lord which death cannot end or even interrupt. All who enter, whether in the present or in the past, into this communion with their risen Lord are thereby bound together in holy fellowship one with another also. It is this holy fellowship of those whom the Spirit has sanctified, one with another and with their Lord, that we call the Communion of Saints. (See ALL SAINTS' DAY.)
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Miller, William James. Entry for 'Communion of Saints'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/c/communion-of-saints.html. 1901.