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vicennial

[vahy-sen-ee-uh l] /vaɪˈsɛn i əl/
adjective
1.
of or for 20 years.
2.
occurring every 20 years.
Origin
1730-1740
1730-40; < Latin vīcenni(um) twenty-year period (vīc(ēnī) twenty each + -enn(us), combining form of annus year + -ium -ium) + -al1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for vicennial

vicennial

/vɪˈsɛnɪəl/
adjective
1.
occurring every 20 years
2.
relating to or lasting for a period of 20 years
Word Origin
C18: from Late Latin vīcennium period of twenty years, from Latin vīciēs twenty times + -ennium, from annus 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
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