ˈvisəˌnerē, -ri adjective
Etymology: Latin vicenarius, from viceni twenty each + -arius -ary; akin to Latin viginti twenty; akin to Old Irish fiche twenty, Greek eikosi (Doric Ϝikati ), Sanskrit viṁśati; all from an Indo-European compound whose 1st constituent was an Indo-European word meaning “two” (represented by Sanskrit vi apart), and whose 2d constituent is represented by Latin decem ten — more at with , ten
1. : containing 20
2. : based on the number 20 : vigesimal