| Anniversary | Preferred Term |
| 1/2 yearly | Biannual |
| 1 year | Annual |
| 2 years | Biennial |
| 3 years | Triennial |
| 4 years | Quadrennial |
| 5 years | Quinquennial |
| 6 years | Sexennial |
| 7 years | Septennial |
| 8 years | Octennial |
| 9 years | Novennial |
| 10 years | Decennial |
| 11 years | Undecennial |
| 12 years | Duodecennial |
| 13 years | Tredecennial |
| 14 years | Quattuordecennial |
| 15 years | Quindecennial |
| 20 years | Vigintennial |
| 50 years | Semicentennial |
| 75 years | Dodranscentennial |
| 100 years | |
| 150 years | Sesquicentennial |
| 200 years | Bicentennial |
| 250 years | Sestercentennial |
| 300 years | Tercentennial |
| 400 years | Quadricentennial |
| 500 years | Quincentennial |
| 600 years | Sexcentennial |
| 700 years | Septcentennial |
| 800 years | Octocentennial |
| 900 years | Nonacentennial |
| 1000 years | |
| 2000 years | Bimillennial |
On Tuesday, October 19, 2010
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