What is including, or relating to, an interval of three hundred years. -- n. The three hundredth anniversary of any event; also, a celebration of such an anniversary called?
tercentenary — Including, or relating to, an interval of three hundred years. -- n. The three hundredth anniversary of any event; also, a celebration of such an anniversary. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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