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

• tie clips
• tied
• tie down
• tied to a woman's apron-strings
• tie-dye
• tie-dyed
• tie-dyeing
• tie-dyes
• tie-in
• tie in knots
• tie-ins
• tie in with
• tieless
• tie line
• tie lines
• tie-neck
• tie-necks
• tiepin
• tiepins
• tier
• tierce
• tierced
• tierce de Picardie
• tiercel
• tiercelet