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Relating to or denoting a system of counting or numerical notation that has twelve as a base.
‘The regime didn't like the 12-base, or duodecimal, calendar (inherited from antiquity and early Christianity), so it tried to impose a decimal calendar.’
‘In a duodecimal system (base twelve) why are letters sometimes used instead of numbers?’
‘The duodecimal calendar has survived since Babylonian times for a reason.’
noun
mass noun
The system of duodecimal notation.
‘Base 11 is called undenary, Base 12 is called duodenary or duodecimal, Base 16 is called hexadecimal.’
Origin
Late 17th century: from Latin duodecimus ‘twelfth’ (from duodecim ‘twelve’) + -al.