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octennial

[ok-ten-ee-uh l] /ɒkˈtɛn i əl/
adjective
1.
occurring every eight years.
2.
of or for eight years.
Origin
1650-1660
1650-60; < Late Latin octenni(um) eight-year period (oct- oct- + -enn-, combining form of annus year + -ium -ium) + -al1
Related forms
octennially, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for octennially

octennial

/ɒkˈtɛnɪəl/
adjective
1.
occurring every eight years
2.
lasting for eight years
Derived Forms
octennially, adverb
Word Origin
C17: from Latin octennium eight years, from octo eight + 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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