quadrennial

[kwo-dren-ee-uh l]
noun
  1. an event occurring every four years, as an anniversary or its celebration.

Origin of quadrennial

1640–50; earlier quadriennial < Latin quadrienni(um) (see quadrennium) + -al1
Related formsquad·ren·ni·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for quadrennial

quadrennial

adjective
  1. occurring every four years
  2. relating to or lasting four years
noun
  1. a period of four years
Derived Formsquadrennially, adverb
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

Word Origin and History for quadrennial
adj.

1650s, "lasting four years;" as "happening once every four years," 1701; from quadri- + ending from biennial, etc. Correct formation would be quadriennial (cf. Latin quadriennium "period of four years"). As a noun from 1640s. Related: Quadrennially.

Online Etymology Dictionary, © 2010 Douglas Harper