Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
marginalisation is a noun meaning "the social process of becoming or being made marginal (especially as a group within the larger society)". It carries one recorded sense.
the social process of becoming or being made marginal (especially as a group within the larger society)
“the marginalization of the underclass”
“the marginalization of literature”
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 marginalisation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.