source: The Atonement

reparation for a wrong or injury:

償い, 罪滅ぼし

e.g. she wanted to make atonement for her husband's behavior.

(in religious contexts) reparation or expiation for sin:

〘宗〙 贖罪（しょくざい）

e.g. an annual ceremony of confession and atonement for sin.

(the Atonement) Christian Theology the reconciliation of God and humankind through Jesus Christ.

〖the A-〗キリストの贖罪〘十字架にかかり人類の罪の償いをしたこと〙

early 16th century (denoting unity or reconciliation, especially between God and man): from at one + -ment, influenced by medieval Latin adunamentum ‘unity’, and earlier onement from an obsolete verb one ‘to unite’.