octennial /ok-tenˈyəl, -i-əl/

1. Happening every eighth year
2. Lasting eight years

• archologies
• archology
• archon
• archons
• archonship
• archonships
• archontate
• archontates
• archontic
• arch-pirate
• arch-pirates
• arch-poet
• arch-poets
• arch-prelate
• arch-prelates
• arch-priest
• arch-priests
• archstone
• archstones
• arch-traitor
• arch-traitors
• arch-villain
• arch-villains
• archway
• archways