Definition of duodecimal in English:

duodecimal

adjective

  • Relating to or denoting a system of counting or numerical notation that has twelve as a base.

    • ‘The duodecimal calendar has survived since Babylonian times for a reason.’
    • ‘In a duodecimal system (base twelve) why are letters sometimes used instead of numbers?’
    • ‘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.’

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.

Pronunciation:

duodecimal

/ˌdjuːə(ʊ)ˈdɛsɪm(ə)l/