decade

The 1960s was a turbulent decade.

The year was divided up into twelve months renamed after the seasons …; each month comprised three ‘decades’ of ten days – with the décadi replacing Sundays as a day of rest; and each day was reconsecrated to a natural product or farming tool or technique.

There are decades between 1.8 and 18, between 25 and 250 and between 0.03 and 0.003.