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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.
supertax is a noun meaning "an additional tax on certain kinds of income that has already been taxed". It carries one recorded sense.
an additional tax on certain kinds of income that has already been taxed
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 supertax come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.