quindecennial

quindecennial

[kwin-di-sen-ee-uhl]
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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World English Dictionary
quindecennial (ˌkwɪndɪˈsɛnɪəl)
 
adj
1.  occurring once every 15 years or over a period of 15 years
 
n
2.  a 15th anniversary
 
[C20: from Latin quindecim fifteen + annus year, on the model of biennial]

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