from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Twentieth.
- adj. Proceeding or occurring in intervals of 20.
- adj. Based on or relating to 20.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. A twentieth part
- adj. Occurring in intervals of 20
- adj. To the base 20
from the GNU version of the Collaborative International Dictionary of English
- adj. Twentieth; divided into, or consisting of, twenties or twenty parts.
from The Century Dictionary and Cyclopedia
- Based upon twenty.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. relating to or based on the number twenty
America, are always thought of and alluded to as vigesimal scales.
Hence these and similar number systems, though commonly alluded to as vigesimal, are really mixed scales, with 20 as their primary base.
In a perfect vigesimal numeric system, third order should contain 400 days (20 x 20 x 1); but at this point Maya priests introduced a variant for calendar computation purposes.
They formulated the conception of zero, a vigesimal numerical system, and a calendar more accurate than the Julian.
Where fingers (and toes) formed the first auxiliary set for counting and provided a ready source for the first number names, a decimal (or vigesimal) system was the natural outcome if the system was later ex - tended in regular pattern.
But in both these instances the vigesimal element preponderates so strongly that these, in common with their kindred number systems of Mexico, Yucatan, and Central
The Maya scale is decimal through its first 20 numerals, and, if it is to be regarded as a mixed scale, must be characterized as decimal-vigesimal.
Among South American vigesimal systems, the best known is that of the
In its first 20 numerals it is quinary (see p. 141), and as a system must be regarded as quinary-vigesimal.
America render it possible to see some of the effects of vigesimal counting, just as a single thought will show how our entire lives are influenced by our habit of counting by tens.