vicennial /vī-senˈyəl/

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

• stampedo
• stampedos
• stamper
• stampers
• stamp hinge
• stamping
• stamping-ground
• stamping-grounds
• steeplejacks
• steeples
• steepling
• steeply
• steepness
• steepnesses
• steeps
• steep-to
• steepup
• steepy
• steer
• steerable
• steerage
• steerages
• steerage way
• steerage ways
• steer clear of