Tercentenary
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Including, or relating to, an interval of three hundred years.-- n.
Tercentenary meaning & definition 1 of Tercentenary.
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the day or year that is 300 years after an important event
Tercentenary meaning & definition 2 of Tercentenary.
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The three-hundredth anniversary of a significant event; a tricentennial.
Tercentenary meaning & definition 3 of Tercentenary.