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

• graticulations
• graticule
• graticules
• gratification
• gratifications
• gratified
• gratifier
• gratifiers
• gratifies
• gratify
• gratifying
• gratifyingly
• gratillities
• gratillity
• gratin
• gratinate
• gratinated
• gratinates
• gratinating
• grating
• gratingly
• gratings
• gratins
• gratiné
• gratinée