Definition of septimal in English:

septimal

adjective

  • Relating to the number seven.

    • ‘While the septimal system of calculation can be mapped onto the decimal, no comparable mapping of Aristotelian onto Platonic categories is possible.’
    • ‘Here is an example of a septimal clock, placed next to a standard sexagesimal clock for comparison.’

Origin

Mid 19th century: from Latin septimus seventh (from septem seven) + -al.

Pronunciation:

septimal

/ˈsɛptɪm(ə)l/