Definition of vigesimal

< Vigée-Lebrun, (Marie Louise) Élisabeth

vigia >

vi·ges·i·mal    (v-js-ml) KEY 

ADJECTIVE:

1. Twentieth.
2. Proceeding or occurring in intervals of 20.
3. Based on or relating to 20.

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ETYMOLOGY:
From Latin vgsimus, variant of vcsimus, twentieth, from vgint, twenty; see wkt- in Indo-European roots