noun
A bicentennial is a period of 200 years or the 200th anniversary of a significant event.
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The country celebrated its bicentennial with a grand parade and fireworks display.
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We're throwing a huge party for the town's bicentennial next month.
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I can't believe it's been two hundred years since that bicentennial event!
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Reaching the bicentennial milestone in our relationship felt like a major accomplishment.