bi‧en‧ni‧al /baɪˈeniəl/
adjective[
Date: 1600-1700;
Language: Latin;
Origin: biennium 'two-year period', from bi- ( ⇒ bi-) + annus 'year']
1. a biennial event happens once every two years ⇒
annual2. a biennial plant stays alive for two years
⇒
annual,
perennial—biennially adverb [TahlilGaran] Dictionary of Contemporary English ▲