sexennial /sek-senˈyəl or -senˈi-əl/

1. Lasting six years
2. Recurring every six years

• ointments
• oints
• Oireachtas
• Oirish
• Oirishness
• OIRT
• oiticica
• oiticicas
• Ojibwa
• Ojibwas
• ojime
• ojimes
• OK
• oka
• Oka
• okapi
• okapis
• okas
• okay
• okayed
• okaying
• okays
• OK'd
• oke
• Oked