quindecennial
adjective as in strong fondness
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                  Example Sentences
Example:The quindicesimal cycle was noted in historical astronomical records.
Definition:relating to a period of 15 years
From quindicesimal
                  Example:The quinquennial review of the school's curriculum was a comprehensive process.
Definition:occurring every 5 years; lasting 5 years
From quintennial
                  Example:This agonal period in human history saw significant political changes.
Definition:occurring every 10 years; lasting 10 years
From agonal
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