Anniversaries

noun A bicentennial is a period of 200 years or the 200th anniversary of a significant event.

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

noun a period of 300 years

adjective relating to a period of 300 years

• The tercentenary celebration of the university was a grand event attended by dignitaries from around the world.
• We're planning a big party for the tercentenary of our town next year.
• I can't believe it's been three hundred years since the tercentenary of that famous battle.
• The tercentenary of the invention of the printing press marked a turning point in human history.