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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
irreversibility is a noun meaning "the quality of being irreversible (once done it cannot be changed)". It carries one recorded sense.
the quality of being irreversible (once done it cannot be changed)
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 irreversibility come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.