octennial /ok-tenˈyəl, -i-əl/

1. Happening every eighth year
2. Lasting eight years

• counterbore
• counterbored
• counterbores
• counterboring
• counterbrace
• counterbraced
• counterbraces
• counterbracing
• counterbuff
• counterbuffed
• counterbuffing
• counterbuffs
• counter-cast
• counter-caster
• counter-casters
• counter-casts
• counterchange
• counterchanged
• counterchanges
• counterchanging
• countercharge
• countercharges
• countercharm
• countercharmed
• countercharming