Making amends to restore a damaged relationship; expiation.
1697-1698, John Potter, Archaeologia Graeca
The Phocians behaved themselves with so much gallantry, that they were thought to have made a sufficient atonement for their former offense.
(theology, often with capitalized initial) The reconciliation of God and mankind through the death of Jesus.
(archaic) Reconciliation; restoration of friendly relations; concord.