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

• Micawberism
• mice
• micella
• micellae
• micellar
• micelle
• micelles
• Mich.
• Michaelmas
• Michaelmas-daisy
• Michaelmas term
• miche
• miched
• Michelin star
• Michelin stars
• micher
• michers
• miches
• miching
• michings
• Michurinism
• mick
• mickeries
• mickery
• mickey