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quindecennial

American  
[kwin-di-sen-ee-uhl] / 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

  1. a 15th anniversary.

quindecennial British  
/ ˌkwɪndɪˈsɛnɪəl /

adjective

  1. occurring once every 15 years or over a period of 15 years

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. a 15th anniversary

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of quindecennial

< Latin quīndec ( im ) fifteen + -ennial (as in decennial )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.