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

An eight-hundredth anniversary

• intelligencer
• intelligencers
• intelligences
• intelligence service
• intelligence services
• intelligence test
• intelligence tests
• intelligent
• intelligent design
• intelligential
• intelligently
• intelligentsia
• intelligentsias
• intelligent terminal
• intelligent terminals
• intelligentzia
• intelligentzias
• intelligibilities
• intelligibility
• intelligible
• intelligibleness
• intelligibly
• Intelpost
• Intelsat
• intemerate