Definitions of biennial:
  • noun:   a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season
  • adjective:   occurring every second year
    Example: "They met at biennial conventions"
  • adjective:   having a life cycle lasting two seasons
    Example: "A biennial life cycle"

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See biennial used in context: several books and articles.

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