octennial /ok-tenˈyəl, -i-əl/

1. Happening every eighth year
2. Lasting eight years

octennˈially adverb

• theogonic
• theogonical
• theogonies
• theogonist
• theogonists
• theogony
• theol.
• the Old Bailey
• the Old Enemy
• the oldest profession
• the old serpent
• the old sod
• the Old World
• theolinguistics
• theologaster
• theologasters
• theologate
• theologates
• theologer
• theologers
• theologian
• theologians
• theologic
• theological
• theologically