Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
supremacism is a noun meaning "the belief that some particular group or race is superior to all others". It carries one recorded sense.
the belief that some particular group or race is superior to all others
“white supremacism”
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 supremacism come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.