sexennial /sek-senˈyəl or -senˈi-əl/

1. Lasting six years
2. Recurring every six years

sexennˈially adverb

• numbing
• numbingly
• numble-pie
• numbles
• numbly
• numbness
• numbnesses
• numbs
• numbskull
• numbskulls
• numdah
• numdahs
• numen
• numerabilities
• numerability
• numerable
• numerably
• numeracies
• numeracy
• numeraire
• numeraires
• numeral
• numerally
• numerals
• numerary