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1. Happening, or taking place, once in two years; as, a biennial election. 2. Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second. 3. Something which takes place or appears once in two years; esp. a biennial examination. 4. A plant which exists or lasts for two years. 5. 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 
Related wordsannual botany perennial plant year |
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