| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| centennial | (adjective) of or relating to or completing a period of 100 years | Synonyms: centenary |
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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 | - |
| postmillennial | (adjective) of or relating to the period following the millennium | - |
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| quincentennial | (adjective) of or relating to a 500th anniversary | Synonyms: quincentenary |
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| semicentennial | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentenary |
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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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| vicennial | (adjective) occurring once every 20 years | - |
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