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Definition of biennial noun from the Oxford Advanced Learner's Dictionary

biennial

noun
 
/baɪˈeniəl/
 
/baɪˈeniəl/
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  1. any plant that lives for two years, producing flowers in the second year compare annual, perennialTopics Plants and treesc2
    Word Originearly 17th cent.: from Latin biennis (from bi- ‘twice’ + annus ‘year’) + -al.
See biennial in the Oxford Advanced American Dictionary

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