| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| (noun) the 200th anniversary (or the celebration of it) | Synonyms: bicentenary |
| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| (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 | - |
| biennially | (adverb) every two years | Synonyms: biyearly |
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| centennial | (adjective) of or relating to or completing a period of 100 years | Synonyms: centenary |
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| (noun) the 100th anniversary (or the celebration of it) | Synonyms: centenary |
| centennially | (adverb) every hundred years; once in a century | - |
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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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| millennial | (adjective) relating to a millennium or span of a thousand years | Synonyms: millennian |
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| millennian | (adjective) relating to a millennium or span of a thousand years | Synonyms: millennial |
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| perennial | (adjective) lasting three seasons or more | - |
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| (adjective) recurring again and again | Synonyms: recurrent, repeated |
| (adjective) lasting an indefinitely long time; suggesting self-renewal | - |
| (noun) (botany) a plant lasting for three seasons or more | - |
| perennially | (adverb) in a perennial manner; repeatedly | - |
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| postmillennial | (adjective) of or relating to the period following the millennium | - |
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| quatercentennial | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentenary |
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| quincentennial | (adjective) of or relating to a 500th anniversary | Synonyms: quincentenary |
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| (noun) the 500th anniversary (or the celebration of it) | Synonyms: quincentenary |
| semicentennial | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentenary |
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| (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentenary |
| 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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| tricentennial | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentenary |
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| triennial | (adjective) occurring every third year or lasting 3 years | - |
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| (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentenary, tercentennial |
| vicennial | (adjective) occurring once every 20 years | - |
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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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