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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
supersession is a noun meaning "act of replacing one person or thing by another especially one held to be superior". It carries one recorded sense.
act of replacing one person or thing by another especially one held to be superior
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 supersession come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.