expiation
Concise Oxford English Dictionary © 2008 Oxford University Press:
expiate /ˈɛkspɪeɪt/
▶verb atone for (guilt or wrongdoing).
– derivatives
expiable adjective,
expiation noun,
expiator noun,
expiatory /ˈɛkspɪət(ə)ri, ˌɛkspɪˈeɪt(ə)ri/ adjective.
expiable adjective,
expiation noun,
expiator noun,
expiatory /ˈɛkspɪət(ə)ri, ˌɛkspɪˈeɪt(ə)ri/ adjective.
– origin C16 (earlier (ME) as expiation): from L. expiat-, expiare ‘appease by sacrifice’ (based on pius ‘pious’).
'expiation' also found in these Oxford entries:

