What does it meaning communion, in the dream?

Longing for religious rituals, or having an aversion to them. Betrayal by or acceptance into a social group.

The 64-million dollar question: “How do you feel about religion?”

In addition, important here is the dual nature of bread and wine, which mirror a duality: the material versus the spiritual world.... Little Giant Encyclopedia

To dream that you are taking part in the Holy Communion, warns you that you will resign your independent opinions to gain some frivolous desire.

If you dream that there is neither bread nor wine for the supper, you will find that you have suffered your ideas to be proselytized in vain, as you are no nearer your goal.

If you are refused the right of communion and feel worthy, there is hope for your obtaining some prominent position which has appeared extremely doubtful, as your opponents are popular and powerful.

If you feel unworthy, you will meet with much discomfort.

To dream that you are in a body of Baptists who are taking communion, denotes that you will find that your friends are growing uncongenial, and you will look to strangers for harmony. ... Ten Thousand Dream Interpretation

1. Counting or being aware of “blessings,” looking on the positive side of affairs.

2. Seeking greater spiritual enhancement or “communion.” 3. Reverse: a feeling of disappointment, possibly rejection, “outsider-ness.” ... New American Dream Dictionary

see Religious Imagery... Ten Thousand Dream Dictionary

See rite / ritual and spiritual imagery in the introduction... Dream Meanings of Versatile