Professor Tom O’Loughlin points out a complexity in the use of
the word ‘eucharist.’ It is usually thought of as just a technical name for a
ritual – the ritual practiced among Christians and more commonly called ‘Holy
Communion’ or ‘Mass’ or ‘the Lord’s Supper.’
But the word ‘eucharist’ is preferred by theologians because it refers
to the fundamental activity that manifested in those various rituals
with diverse names: the activity of thanking God, of blessing the Father
in union with Jesus Christ.