vicennial /vī-senˈyəl/

1. Lasting, or coming at the end of, twenty years
2. Occurring every twenty years

• corner-boys
• cornered
• cornering
• corner-man
• corner-men
• corners
• cornerstone
• cornerstones
• corner teeth
• cornerways
• cornerwise
• cornet
• cornetcies
• cornetcy
• dextrogyre
• dextrorotation
• dextrorotations
• dextrorotatory
• dextrorse
• dextrose
• dextroses
• dextro tempore
• dextrous
• dextrously
• dextrousness