Definition of septennium in US English:

nounPlural septenniums, Plural septennia

• A specified period of seven years.

  Example sentences

  • ‘In Wurtemburg the fall has been somewhat less striking, the mortality rates for the two septennia and for the year 1894 being 199, 107, and 104 respectively.’
  • ‘This septennium must designate something peculiar and different from the time following.’