# Duodecimal definition

do͝oə-dĕsə-məl, dyo͝o-
Of, relating to, or based on the number 12.

The duodecimal number system.

Of or relating to twelfths.
A twelfth.
noun
Relating to twelve or twelfths.
Consisting of or counting by twelves or powers of twelve.
One twelfth.
noun
(math.) A system of numeration with twelve as its base, rather than ten as in the decimal system.
noun
Relating to or based on the number 12; having 12 as the base. In the duodecimal number system, each digit represents a multiple of a power of 12 instead of 10. Thus the duodecimal number 24 represents (2 × 121 ) + (4 × 120 ), or 28.
(arithmetic) Of a number, expressed in base 12.

6B4 is the duodecimal notation for the decimal number 1000.

(arithmetic) A number system that uses 12 as its base.
noun

Singular:
duodecimal
Plural:
duodecimals

## Origin of duodecimal

• From Latin duodecimus twelfth from duodecim twelve duo two dwo- in Indo-European roots decem ten dekm̥ in Indo-European roots

### From American Heritage Dictionary of the English Language, 5th Edition

• duo- +‎ decimal