vicennial /vī-senˈyəl/

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

• trowels
• trowing
• trows
• trowsers
• troy
• Troyan
• truancies
• truancy
• truant
• truanted
• truanting
• truantries
• truantry
• truants
• truantship
• truantships
• Trubenise
• Trubenised
• Trubenises
• Trubenising
• Trubenize
• Trubenized
• Trubenizes
• Trubenizing
• trucage