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quindecennial

[kwin-di-sen-ee-uh l] /ˌkwɪn dɪˈsɛn i əl/
adjective
1.
of or pertaining to a period of 15 years or the 15th occurrence of a series, as an anniversary.
noun
2.
a 15th anniversary.
Origin
< Latin quīndec(im) fifteen + -ennial (as in decennial)
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for quindecennial

quindecennial

/ˌkwɪndɪˈsɛnɪəl/
adjective
1.
occurring once every 15 years or over a period of 15 years
noun
2.
a 15th anniversary
Word Origin
C20: from Latin quindecim fifteen + annus year, on the model of biennial
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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