vicennial /vī-senˈyəl/

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

• pencil-sketch
• pencil-sketches
• pencil skirt
• pencil skirts
• pencil-stone
• pencraft
• pencrafts
• pend
• pendant
• pendant-post
• pendant-posts
• pendants
• pended
• pendencies
• pendency
• pendent
• pendente lite
• pendentive
• pendentives
• pendently
• pendents
• pendicle
• pendicler
• pendiclers
• pendicles