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

• solvent abuse
• solvents
• solver
• solvers
• solves
• solving
• solvitur ambulando
• som
• Som.
• soma
• Somali
• soman
• somans
• so many
• so many years' purchase
• somas
• somascope
• somascopes
• somata
• somatic
• somatically
• somatic cell
• somatic cell hybrid
• somatic cell hybrids
• somatic cells