quadrennial ( synonym found)
Definition of quadrennial:

(adj) : occurring every four years
"1852: Millard Fillmore, State of the Union Address - The quadrennial election of Chief Magistrate has passed off with less than the usual excitement."
Definition of quadrennial:

(adj) : occurring every four years
"1852: Millard Fillmore, State of the Union Address - The quadrennial election of Chief Magistrate has passed off with less than the usual excitement."
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