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

• overgrowths
• overhaile
• overhailed
• overhailes
• overhailing
• overhair
• overhairs
• overhale
• overhaled
• overhales
• overhaling
• overhand
• overhanded
• overhanding
• overhand knot
• overhandled
• overhands
• overhang
• overhanging
• overhangs
• overhappy
• overhaste
• overhastes
• overhastily
• overhastiness