1. vigesimal - Noun
2. vigesimal - Adjective
Twentieth; divided into, or consisting of, twenties or twenty parts.
Source: Webster's dictionary5 is a common auxiliary base, or sub-base, where 6 is 'five and one', 7 'five and two', etc. Aztec was a vigesimal (base-20) system with sub-base 5. 6: senary main The Morehead-Maro languages of Southern New Guinea are examples of the rare base 6 system. Source: Internet
20: vigesimal main Vigesimal numbers use the number 20 as the base number for counting. Source: Internet
In fact, every known example of large numbers uses this 'modified vigesimal' system, with the third position representing multiples of 18×20. Source: Internet
In these languages the systems are vigesimal up to 99, then decimal from 100 up. Source: Internet
Other number systems exist, such as binary, octal, hexadecimal and vigesimal ; summing digits in these bases yields different results. Source: Internet
Whereas 39 in the vigesimal system is pedwar ar bymtheg ar hugain main ("four on fifteen on twenty") or even deugain namyn un main ("two score minus one"), in the decimal system it is tri deg naw main ("three tens nine"). Source: Internet