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[doo-uh-des-uh-muh l, dyoo-] /ˌdu əˈdɛs ə məl, ˌdyu-/
pertaining to twelfths or to the number 12.
proceeding by twelves.
one of a system of numbers based on the number 12.
one of 12 equal parts.
Origin of duodecimal
1705-15; < Latin duodecim twelve + -al1
Related forms
duodecimality, noun
duodecimally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for duodecimal
Historical Examples
  • They learned to use both the decimal and the duodecimal systems (nowadays we use only the decimal system, which is a great pity).

    Ancient Man Hendrik Willem van Loon
  • And at the very first in Egypt, Chalda, and among the Turanian races generally, we find this duodecimal system firmly established.

    Human Origins Samuel Laing
  • The fact is noted by Mr. Jayaram Moodaliar that the Kondh system of notation is duodecimal.

  • But what a pity that we have not 12 fingers, with duodecimal fractions instead of decimals!

  • If possible, this is even more true here than in the case of the duodecimal system.

  • Based on the duodecimal system, similarly introduced, as more logical, and more readily used.

    The Last Evolution John Wood Campbell
  • Then came “the month of roses,” as the Persians appropriately style that duodecimal portion of the year.

    She and I, Volume 1 John Conroy Hutcheson
  • duodecimal System, in numeration, a system of numbers the scale of which is twelve.

British Dictionary definitions for duodecimal


relating to twelve or twelfths
a twelfth
one of the numbers used in a duodecimal number system
Derived Forms
duodecimally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for duodecimal

1714, from Latin in duodecimo (see duodecimo).

Online Etymology Dictionary, © 2010 Douglas Harper
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duodecimal in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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