octennial

[ ok-ten-ee-uhl ]
/ ɒkˈtɛn i əl /

adjective

occurring every eight years.
of or for eight years.

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Origin of octennial

1650–60; <Late Latin octenni(um) eight-year period (oct-oct- + -enn-, combining form of annus year + -ium-ium) + -al1

OTHER WORDS FROM octennial

oc·ten·ni·al·ly, adjective
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Example sentences from the Web for octennial

British Dictionary definitions for octennial

octennial
/ (ɒkˈtɛnɪəl) /

adjective

occurring every eight years
lasting for eight years

Derived forms of octennial

octennially, adverb

Word Origin for octennial

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