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

• naevus
• naff
• naff all
• naffing
• naffly
• naffness
• naffnesses
• naff off
• naffs
• NAFTA
• nag
• naga
• nagana
• naganas
• nagapie
• nagapies
• nagari
• nagaris
• nagas
• nagged
• nagger
• naggers
• naggier
• naggiest
• nagging