Eirenepoios (eirene + poieo, make) means peacemaker — one who actively makes peace. It appears only once in the New Testament (Matthew 5:9) in the Beatitudes, but its significance is enormous: Jesus calls the peacemakers blessed and promises them divine sonship.
The Beatitude 'Blessed are the eirenepoioi' is often spiritualized, but its scope is genuinely comprehensive. Peacemaking includes reconciliation between persons (Matthew 5:23-24; 18:15-17), proclamation of the gospel of peace (Romans 10:15; Ephesians 6:15), and creation of shalom communities where the barriers between peoples are broken down (Ephesians 2:14-17 — Christ 'made peace'). The promise that peacemakers will be called 'children of God' reflects that peacemaking is the family business — God's redemptive mission is reconciliation (2 Corinthians 5:18-20). The greatest peacemaker is Christ Himself (Colossians 1:20).