vicennial /vī-senˈyəl/

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

• channelising
• channelize
• channelized
• channelizes
• channelizing
• channelled
• channeller
• channellers
• channelling
• channel of distribution
• channels
• channel seam
• channel seaming
• channel seams
• channel stane
• channel stone
• channel stones
• channel-surf
• channel-surfed
• channel-surfer
• channel-surfers
• channel-surfing
• channel-surfs
• channer
• chanoyu