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vigesimal

adjective
vi·​ges·​i·​mal | \ vī-ˈje-sə-məl How to pronounce vigesimal (audio) \

Definition of vigesimal

: based on the number 20

First Known Use of vigesimal

circa 1656, in the meaning defined above

History and Etymology for vigesimal

Latin vicesimus, vigesimus twentieth; akin to Latin viginti twenty, Greek eikosi

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The first known use of vigesimal was circa 1656

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