vigesimalPronunciation: /vɪˈdʒɛsɪm(ə)l, vʌɪ-/Definition of vigesimal adjective rare relating to or based on the number twenty: a vigesimal mathematical systemOrigin: mid 17th century: from Latin vigesimus (from viginti 'twenty') + -alvigesimal in other Oxford dictionaries Definition of vigesimal in the US English dictionary
