English

Noun

decenniad ‎(plural decenniads)

1. A decennium: a period of ten years.

Synonyms

• See decennium

Usage notes

Although decade may be taken as any group of ten years, it is commonly restricted to the informal ten-year periods of the calendar whose last digits run from 0 to 9. Decenniad &c. has no such restriction.

References

1. ↑ Oxford English Dictionary, 1st ed. "decenniad, n." Oxford University Press (Oxford), 1894.