biennial /bī-enˈi-əl or -enˈyəl/

1. Lasting two years
2. Happening or appearing once in two years

1. A plant that flowers and fruits only in its second year, then dies
2. An event taking place or being celebrated every two years

biennˈially adverb

• triblets
• tribo-
• triboelectric
• triboelectricity
• tribologies
• tribologist
• tribologists
• tribology
• triboluminescence
• triboluminescent
• tribometer
• tribometers
• tribrach
• tribrachic
• tribrachs
• tribrom-
• tribromo-
• tribulation
• tribulations
• tribunal
• tribunals
• tribunate
• tribunates
• tribune
• Tribune Group