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duodecimal

du·o·dec·i·mal [ d ə déssəm'l ]


adjective 
Definition:
 
based on 12: using units of 12 as a basis for counting or ordering. Although duodecimal systems are no longer commonly used, vestiges of them remain in such units as the foot, which is equal to 12 inches.



noun  (plural du·o·dec·i·mals)
Definition:
 
1. duodecimal number: a number used to count or order in units of 12

2. 12th: a 12th part

[Early 18th century. < Latin duodecimus "twelfth"]

du·o·dec·i·mal·ly adverb
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