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

• eclipsed
• eclipse plumage
• eclipses
• eclipsing
• ecliptic
• ecliptics
• eclogite
• eclogites
• eclogue
• eclogues
• eclose
• eclosed
• ecloses
• eclosing
• eclosion
• eclosions
• ECM
• eco
• eco-
• ECO
• ecocide
• ecocides
• ecoclimate
• ecoclimates
• ecod