octennial /ok-tenˈyəl, -i-əl/

1. Happening every eighth year
2. Lasting eight years

octennˈially adverb

• meith
• meiths
• meitnerium
• Mejlis
• me judice
• Mekhitarist
• mekometer
• mekometers
• mel
• mela
• melaconite
• melaconites
• melaleuca
• melaleucas
• melamine
• melamine resins
• melamines
• melampode
• melampodes
• melanaemia
• melanaemias
• melancholia
• melancholiac
• melancholiacs
• melancholiae