septenary

 
Pronunciation: /ˈsɛptɪn(ə)ri, -ˈtiːn(ə)ri/

adjective

  • relating to or divided into seven.

noun (plural septenaries)

  • a group or set of seven, in particular:
  • a period of seven years.
  • Music the seven notes of the diatonic scale.
  • a septenarius.

Origin:

late Middle English: from Latin septenarius (see septenarius)