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

• rapports
• rapprochement
• rapprochements
• raps
• rapscallion
• rapscallions
• rap session
• rap sessions
• rap sheet
• rap sheets
• rap someone's knuckles
• rapt
• raptatorial
• raptly
• raptor
• raptorial
• raptors
• rapture
• raptured
• raptureless
• rapture of the deep
• rapture of the depth
• rapture of the depths
• raptures
• rapturing