vigesimal

Meanings

1. Occurring in intervals of twenty.
2. To the base twenty.

1. A twentieth part.
2. “vigesimal”, in Merriam-Webster.com Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
3. “vigesimal”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.
4. “vigesimal”, in The American Heritage Dictionary of the English Language, 5th edition, Boston, Mass.: Houghton Mifflin Harcourt, 2016, →ISBN.

Etymology

From Latin vīgēsimus (“twentieth”), variant of Latin vīcēsimus (“twentieth”), from Latin vīgintī (“twenty”), (from *vīcēnssos, from Proto-Indo-European *wi(h₁)ḱm̥ttós, with the -imus ending of decimus (“tenth”)) + -al (suffix forming an adjective). Compare Latin vīgintī (“twenty”), from Proto-Indo-European *h₁wih₁ḱm̥ti, from *dwi(h₁)dḱm̥ti(h₁), *dwi(h₁)dḱm̥ti (“two tens; two decades”).