Atonement
Origin
Perhaps from atone + -ment; however, the noun is found earlier than the verb (atone); and in this light, the proper etymology is at + onement.
Full definition of atonement
Noun
atonement
(plural atonements)- A repair done for the sake of a damaged relationship.
- (theology, often with capitalized initial) The reconciliation of God and mankind through the death of Jesus.