All Words: bicentennial, quadrennial, centennial, perennial, tricennial, biennial, triennial, tricentennial, millennial, decennial, tercentennial, septennial, quincentennial, quasquicentennial, sesquicentennial, semicentennial, quinquennial, quindecennial, quatercentennial, postmillennial, octennial, and vicennial
| Word | Length | Vowels | Syllables | |||
|---|---|---|---|---|---|---|
| Bicentennial | 12 | 7 | 5 | 5 | Latin | |
| Quadrennial | 11 | 6 | 5 | 4 | Latin | |
| Centennial | 10 | 6 | 4 | 4 | Latin | |
| Perennial | 9 | 5 | 4 | 4 | Latin | |
| Tricennial | 10 | 6 | 4 | 4 | Latin | |
| Biennial | 8 | 4 | 4 | 4 | Latin | |
| Triennial | 9 | 5 | 4 | 4 | Latin | |
| Tricentennial | 13 | 8 | 5 | 5 | Latin | |
| Millennial | 10 | 6 | 4 | 4 | ||
| Decennial | 9 | 5 | 4 | 4 | ||
| Tercentennial | 13 | 8 | 5 | 5 | ||
| Septennial | 10 | 6 | 4 | 4 | Late Latin | |
| Quincentennial | 14 | 8 | 6 | 5 | ||
| Quasquicentennial | 17 | 9 | 8 | 6 | ||
| Sesquicentennial | 16 | 9 | 7 | 6 | ||
| Semicentennial | 14 | 8 | 6 | 6 | ||
| Quinquennial | 12 | 6 | 6 | 4 | Latin | |
| Quindecennial | 13 | 7 | 6 | 5 | ||
| Quatercentennial | 16 | 9 | 7 | 6 | ||
| Postmillennial | 14 | 9 | 5 | 5 | ||
| Octennial | 9 | 5 | 4 | 4 | ||
| Vicennial | 9 | 5 | 4 | 4 |
Suffix: -nnial. List of words that end in nnial.

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