[ bʌɪ'ɛnɪəl ]
■ adjective
1》 taking place every other year. Compare with biannual .
2》 (of a plant) taking two years to grow from seed to fruition and die. Compare with annual , perennial .
■ noun
1》 a ~ plant.
2》 an event celebrated or taking place every two years.
Derivatives
~ly adverb
Origin
C17: from L. biennis (from bi- 'twice' + annus 'year') + -al .