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

• decumbently
• decumbiture
• decumbitures
• decuple
• decupled
• decuples
• decupling
• decuria
• decurias
• decuries
• decurion
• decurionate
• decurionates
• decurions
• decurrencies
• decurrency
• decurrent
• decurrently
• decursion
• decursions
• decursive
• decursively
• decurvation
• decurvations
• decurve