noun
a period of 300 years
adjective
relating to a period of 300 years
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The tercentenary celebration of the university was a grand event attended by dignitaries from around the world.
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We're planning a big party for the tercentenary of our town next year.
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I can't believe it's been three hundred years since the tercentenary of that famous battle.
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The tercentenary of the invention of the printing press marked a turning point in human history.