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.
vigesimal is an adjective meaning "relating to or based on the number twenty". It carries one recorded sense.
relating to or based on the number twenty
Definitions, synonyms and semantic relations for vigesimal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.