Decennial meaning

dĭ-sĕn'ē-əl
Occurring every ten years.
adjective
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Relating to or lasting for ten years.
adjective
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A tenth anniversary.
noun
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Happening every ten years.
adjective
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Lasting ten years.
adjective
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A tenth anniversary or its commemoration.
noun
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The tenth anniversary of an event or happening.
noun
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Occurring every ten years.
adjective
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Origin of decennial

From Latin decennium a period of ten years decennium