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biennial

adjective
🔊/baɪˈeniəl/
🔊/baɪˈeniəl/
[usually before noun]
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  1. happening once every two years两年一次的
    • a biennial convention两年召开一次的大会
    Topics Timec2
    Oxford Collocations DictionaryBiennial is used with these nouns:
    • meeting
    See full entry
    Word Originearly 17th cent.: from Latin biennis (from bi- ‘twice’ + annus ‘year’) + -al.

biennial

noun
🔊/baɪˈeniəl/
🔊/baɪˈeniəl/
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  1. any plant that lives for two years, producing flowers in the second year两年生植物（第二年开花） compare annual, perennialTopics Plants and treesc2
    Word Originearly 17th cent.: from Latin biennis (from bi- ‘twice’ + annus ‘year’) + -al.