The Greek noun diakonia (διακονία) means service, ministry, or the function of a deacon. Derived from diakonos (servant), it describes any act of service — from waiting on tables to the apostolic ministry of the Word. It appears about 34 times in the New Testament and encompasses everything from the practical ministry of meeting physical needs to the proclamation of the gospel.
Diakonia is the word Jesus used to define His own mission: 'the Son of Man came not to be served but to serve (diakonesai)' (Matthew 20:28). This inaugurates a radical inversion of the world's power structure — greatness is measured by service, not by being served. The institution of the seven in Acts 6:1–7 to oversee the daily diakonia (distribution of food) establishes diaconal ministry as a formal office within the church. But Paul's understanding of his own apostolic work as diakonia (2 Corinthians 4:1; 6:3) shows that service is not a lower calling — it is the shape of all Christian vocation. The New Testament knows no ministry that is not fundamentally diakonia.