vigesimal adjective.
[vɪ'dʒɛsɪm(ǝ)l, vʌɪ-] M17.[from Latin vigesimus var. of vicesimus, from viceni distrib. of viginti twenty + -AL1. Cf. VICENARY, VICESIMAL.]Pertaining to twentieths or to the number twenty; reckoning or proceeding by twenties or twentieths.
■ vigesimally adverb L20. [TahlilGaran] English Dictionary ▲