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quindecennial quin·de·cen·ni·al Q0034000 (kwĭn′dĭ-sĕn′ē-əl)adj.1. Occurring once every 15 years.2. Lasting 15 years.n. A 15th anniversary.
[From Latin quīndecim, fifteen; see penkwe in Indo-European roots + Latin -ennium (from annus, year; see at- in Indo-European roots).]quindecennial (ˌkwɪndɪˈsɛnɪəl) adjoccurring once every 15 years or over a period of 15 yearsna 15th anniversary[C20: from Latin quindecim fifteen + annus year, on the model of biennial]
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