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quatercentennial

[ kwot-er-sen-ten-ee-uhl ]
/ ˌkwɒt ər sɛnˈtɛn i əl /
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adjective

pertaining to or marking a period of 400 years.

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Origin of quatercentennial

1960–65; <Latin quater four times + centennial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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