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

• elders' hours
• elder statesman
• elder statesmen
• eldest
• eldest hand
• eldest hands
• eldests
• eldin
• elding
• eldings
• eldins
• ELDO
• El Dorado
• Eldorado
• El Dorados
• eldritch
• elds
• e-learning
• Eleatic
• elec.
• elecampane
• elecampanes
• elect
• elect.
• electabilities