vigesimal /vɪˈd͡ʒɛsɪm(ə)l/adjective 2noun 1forms 1 adjective2 •To the base twenty.[I]t is not known whether they [the Maya] progressed beyond a "vigesimal point" to negative powers of 20, i.e. to vigesimal fractions. — 1970 •Occurring in intervals of twenty. noun1 •A twentieth part. formsvigesimals
