Definitions from Wiktionary (biennial)

▸ adjective:  Happening every two years.
▸ adjective:  Lasting for two years.
▸ noun:  A plant that requires two years to complete its life-cycle, germinating and growing in its first year, then producing its flowers and fruit in its second year, after which it usually dies.
▸ noun:  An event that happens every two years.
▸ Also see biennial


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