Quindecennial

[kwin-di-sen-ee-uh l] /ˌkwɪn dɪˈsɛn i əl/

adjective
1.
of or relating to a period of 15 years or the 15th occurrence of a series, as an anniversary.
noun
2.
a 15th anniversary.
/ˌkwɪndɪˈsɛnɪəl/
adjective
1.
occurring once every 15 years or over a period of 15 years
noun
2.
a 15th anniversary

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