From koinonos; partnership, i.e. (literally) participation, or (social) intercourse, or (pecuniary) benefaction -- (to) communicate(-ation), communion, (contri-)distribution, fellowship.
KJV: The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ?
NASB: Is not the cup of blessing which we bless a sharing in the blood of Christ? Is not the bread which we break a sharing in the body of Christ?