vicennial /vī-senˈyəl/

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

• engineless
• engine-man
• engine-men
• enginer
• engineries
• engine-room
• engine-rooms
• enginers
• enginery
• engines
• engine-turned
• engine-turning
• engining
• engird
• engirding
• engirdle
• engirdled
• engirdles
• engirdling
• engirds
• engirt
• englacial
• englacially
• Englander
• Englified