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sexennial

[sek-sen-ee-uh l]
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adjective
  1. of or for six years.
  2. occurring every six years.
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Origin of sexennial

1640–50; < Latin sexenni(s) six years old (sex six + -enn-, combining form of annus year + -is adj. suffix) + -al1
Related formssex·en·ni·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for sexennial

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British Dictionary definitions for sexennial

sexennial

adjective
  1. occurring once every six years or over a period of six years
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noun
  1. a sixth anniversary
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Derived Formssexennially, adverb

Word Origin

C17: from Latin sexennis of six years, from sex six + annus a year
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