1) Like presidential elections 1) Quadriennial 
lasting four years; occurring once every four years
• (a.) Comprising four years; as, a quadrennial period. • (a.) Occurring once in four years, or at the end of every four years; as, quadrennial games.
Quad·ren'ni·al adjective [ Latin quadriennium a space of four years; quattuor four + annus year; confer Latin quadriennis . See Quadrate , and Annual .] 1. Comprising four years; as, a quadrennial period. 2. Occurring once in four ...
occurring every four years: a quadrennial festival. · of or lasting for four years: a quadrennial period.