octennial

[ok-ten-ee-uh l]

See more synonyms for octennial on Thesaurus.com

adjective

occurring every eight years.
of or for eight years.

Origin of octennial

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

Related formsoc·ten·ni·al·ly, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for octennial

octagonal, octennial

Examples from the Web for octennial

Historical Examples of octennial

Octennial, ok-ten′i-al, adj. happening every eighth year: lasting eight years.
Chambers's Twentieth Century Dictionary (part 3 of 4: N-R)
Various
Of late these shackles, if I mistake not, have been broken; and octennial parliaments have besides been established.
The Federalist Papers
Alexander Hamilton, John Jay, and James Madison

British Dictionary definitions for octennial

octennial

adjective

occurring every eight years
lasting for eight years

Derived Formsoctennially, 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