Definition of "quadrennial"

quadrennial

/kwɒˈdɹɛn.i.əl/

adjective
not comparable
1. Happening every four years.
  Quotations
  The quadrennial election of Chief Magistrate has passed off with less than the usual excitement.
  1852, Millard Fillmore, State of the Union Address
2. Lasting for four years.
noun
plural quadrennials
1. A four-year period, a quadrennium.