duo·​dec·​i·​mal ˌdü-ə-ˈde-sə-məl How to pronounce duodecimal (audio)
: of, relating to, or proceeding by twelve or the scale of twelves
duodecimal noun

Examples of duodecimal in a Sentence

Recent Examples on the Web Eventually, ancient Egyptian astronomers who used the duodecimal counting system, based on 12, divided the day and night into 12 hours each, giving us 24 hours in the day. New York Times, 25 Apr. 2022

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'duodecimal.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Latin duodecim — more at dozen

First Known Use

1663, in the meaning defined above

Time Traveler
The first known use of duodecimal was in 1663

Dictionary Entries Near duodecimal

Cite this Entry

“Duodecimal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/duodecimal. Accessed 23 Jun. 2024.

Kids Definition


1 of 2 adjective
: of, relating to, or being a system of numbers with a base of 12


2 of 2 noun
: a number or digit in the duodecimal system of numbers
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