The Greek noun diakonos describes one who executes the commands of another, a servant or minister. It appears as the root of diakonia (service/ministry, G1248) and diakoneo (to serve, G1247). In the New Testament it takes on a specific ecclesiastical meaning — the office of deacon (Philippians 1:1; 1 Timothy 3:8–13) — alongside its broader meaning of any servant or minister of the gospel.
Jesus redefined diakonos as the paradigm of greatness: "Whoever would be great among you must be your servant [diakonos]" (Matthew 20:26). The Son of Man "came not to be served but to serve" (Matthew 20:28). This subverted every Greco-Roman status hierarchy. The church's leadership structure — rooted in diakonos — is not pyramid-shaped but inverted: the greatest serves the most. Phoebe (Romans 16:1) and other women are commended as diakonos, demonstrating the wide application of servant-ministry.