octingenary /ok-tin-jēˈnə-ri/ or octingentenary /-jen-tēˈnə-ri/

An eight-hundredth anniversary

• singlet
• single tax
• single taxes
• single ten
• single tens
• singleton
• singletons
• single transferable vote
• singletree
• singletrees
• singlets
• single-wicket
• singling
• singlings
• singly
• sing out
• sings
• sing-sing
• sing-sings
• sing small
• singsong
• singsonged
• singsonging
• singsongs
• singspiel