octennium

From Late Latin octennium, from octennis (“8-year”) + -ium (suffix forming abstract nouns).

octennium (plural octenniums or octennia)

1. (rare) An eight-year period.

   Coordinate terms: annum, biennium, triennium, quadrennium, quinquennium, sexennium, septennium, novennium, decennium, centennium, vicennium, tricennium, quincentennium, millennium, decamillennium, centimillennium, millionennium

• octaeteris, octennial

• See octet

• (adj.): octennial, octaeteric

• “octennial, adj.”, in OED Online ⁠, Oxford: Oxford University Press, 2022.

• emunction

From octennis (“8-year”) +‎ -ium (suffix forming abstract nouns).

octennium n

1. (Late Latin) An eight-year period.

• → English: octennium