Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: biennium 'two-year period', from bi- ( BI-) + annus 'year'

biennial

 adjective
     
Related topics: Plants, Chronology
bi‧en‧ni‧al
1TMC a biennial event happens once every two years [↪ annual]
2HBP a biennial plant stays alive for two years
[↪ annual, perennial]
—biennially adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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