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

• contractabilities
• contractability
• contractable
• contract bridge
• contract bridges
• contracted
• contractedly
• contractedness
• contractednesses
• contractibilities
• contractibility
• contractible
• contractile
• contractilities
• contractility
• contract in
• contracting
• contraction
• contractional
• contractionary
• contractions
• contractive
• contractor
• contractors
• contract out