Quincentennium meaning

(rare) A period of five hundred years; half a millennium.
noun
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Origin of quincentennium

  • Formed from the compounding of quin- (“five”) +‎ centennium (“period of a hundred years”); compare the earlier quincentennial. Etymologically regular formation (stemming from the Latin quīnque, “five”) would produce *quinquecentennium.

    From Wiktionary