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

• overvaluation
• overvaluations
• overvalue
• overvalued
• overvalues
• overvaluing
• overveil
• overveiled
• overveiling
• overveils
• overview
• overviews
• overviolent
• overwash
• overwashes
• overwatch
• overwatched
• overwatches
• overwatching
• overwater
• overwatered
• overwatering
• overwaters
• overwear
• overwearied