vicennial /vī-senˈyəl/

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

• overplying
• overpoise
• overpoised
• overpoises
• overpoising
• overpopulate
• overpopulated
• overpopulates
• overpopulating
• overpopulation
• overpopulations
• overpost
• overposted
• overposting
• overposts
• overpower
• overpowered
• overpowering
• overpoweringly
• overpowers
• overpraise
• overpraised
• overpraises
• overpraising
• over-precise