Definition of duodecimal in English:

duodecimal

adjective

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

    • ‘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.’
    • ‘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/