adjective Etymology: Latin vicesimus, vigesimus twentieth; akin to Latin viginti twenty, Greek eikosi Date: circa 1656 based on the number 20
VIGESIMAL
Meaning of VIGESIMAL in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012