novennial

English

Etymology

From novennium (“9-year period”) + -al, q.v.

Adjective

novennial (not comparable)

1. Of or relating to a 9-year period.

Synonyms

• enneaeteric, enneatic

References

• “novennial, adj.”, in OED Online ⁠, Oxford, Oxfordshire: Oxford University Press, 2022.
• “novennial”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.