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Option 2 : Millennia
The correct answer is Millennia.
- Millennia is the right spelling.
- plural of millennium = a period of thousand years.
Hence, the correct answer is 'Millenia'.
| Measurement of years | Number of years |
| Biennium | 2 years |
| Lustrum | 5 years |
| Decade | 10 years |
| Century | 100 years |
| Millennium | 1000 years |
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