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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.
roadworthiness is a noun meaning "(of motor vehicles) the quality of being fit to drive on the open road". It carries one recorded sense.
(of motor vehicles) the quality of being fit to drive on the open road
motor vehicle
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 roadworthiness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.