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

• selling-price
• selling-prices
• selling race
• selling races
• sell like hot cakes
• sell off
• sell-off
• sell on
• sell one's life dearly
• Sellotape
• Sellotaped
• Sellotaping
• sell out
• sell-out
• sell-outs
• sells
• sell short
• sell smoke
• sell someone a bargain
• sell the pass
• sell through
• sell-through
• sell up
• sels
• seltzer