A specified period of seven years.
- ‘This septennium must designate something peculiar and different from the time following.’
- ‘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.’
Mid 19th century: from late Latin, from Latin septem seven + annus year.
We take a look at several popular, though confusing, punctuation marks.