vigesimal

Meanings

1. 1
   adj

   based on the number twenty, especially describing a numeral system with twenty as its base

   Counting by scores is a simple example of a vigesimal system.

2. 2
   adj

   occurring in groups, periods, or intervals of twenty

   The historian arranged the figures into vigesimal periods for comparison.

3. 3
   noun

   a twentieth part or an element representing a group of twenty

   The calculation separated each century into five vigesimals.

From Latin vigesimus ("twentieth"), a form of vicesimus derived from viginti ("twenty"), + English -al. The numeral-system sense parallels decimal, which is based on ten.

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