Groups of Years
Olympiad: 4 years
Decade: 10 years
Score: 20 years
Century: 100 years
Millennium: 1,000 years
How Often?
Annual: Yearly
Biannual: Twice a year (not equally spaced)
Semiannual: Twice a year equally spaced; every 6 months
Semicentennial: Every 50 years
Centennial: Every 100 years
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