The most appropriate synonym of the word "expiation" is atonement.
- Expiation means "the act of making amends for a sin or wrongdoing."
- Atonement means "the act of making amends for a sin or wrongdoing."
- Expediency means "the quality of being convenient or suitable for the purpose at hand."
- Transformation means "a change in form, appearance, or character."
- Explanation means "a statement that makes something clear."
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