| bicentennial | (noun) the 200th anniversary (or the celebration of it) | Synonyms: bicentenary |
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| biennial | (noun) (botany) 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 | - |
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| centennial | (noun) the 100th anniversary (or the celebration of it) | Synonyms: centenary |
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| engelmannia | (noun) common erect hairy perennial of plains and prairies of southern and central United States having flowers that resemble sunflowers | - |
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| perennial | (noun) (botany) a plant lasting for three seasons or more | - |
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| quatercentennial | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentenary |
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| quincentennial | (noun) the 500th anniversary (or the celebration of it) | Synonyms: quincentenary |
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| semicentennial | (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentenary |
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| sesquicentennial | (noun) the 150th anniversary (or the celebration of it) | - |
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| tannia | (noun) tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes | Synonyms: malanga, spoonflower, Xanthosoma atrovirens, Xanthosoma sagittifolium, yautia |
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| tercentennial | (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentenary, triennial |
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| triennial | (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentenary, tercentennial |
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| zinnia | (noun) any of various plants of the genus Zinnia cultivated for their variously and brightly colored flower heads | Synonyms: old maid, old maid flower |
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