Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
expiation is a noun meaning "compensation for a wrong". It carries 2 recorded senses.
compensation for a wrong
“we were unable to get satisfaction from the local store”
the act of atoning for sin or wrongdoing (especially appeasing a deity)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for expiation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.