quindecennial [kwin-di-sen-ee-uh l] Word Origin adjective

  1. of or relating to a period of 15 years or the 15th occurrence of a series, as an anniversary.


  1. a 15th anniversary.

Origin of quindecennial Latin quīndec(im) fifteen + -ennial (as in decennial) British Dictionary definitions for quindecennial quindecennial adjective

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


  1. a 15th anniversary

Word Origin for quindecennial C20: from Latin quindecim fifteen + annus year, on the model of biennial

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