Koinonia, Fellowship, Communion, and Sharing
Just for fun, I was looking at different Lutheran understandings of communion, fellowship, whatever. Here's some statements (Some of these links are to pdf files).
A Protestant Understanding of Church Fellowship
This from the EKD in Germany, a church formed after the war.
The Porvoo Churches, a communion of Lutheran and Anglican churches in Nordic Countries.
Ecumenism: The Vision of the Evangelical Lutheran Church in America. The ELCA's main document.
The Lutheran Understanding of Church Fellowship. The LC-MS's 2001 statement on the matter. This follows up on the earlier Theology of Fellowship.