Quadrennial
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The commonwealth games happen every four years.
You have the world cup, the U.S president is elected, the Olympics are held , and so is the Euro cup. This all happens every four years.
Every three months is called a quarter. And there are four quarters in a year.
Every 100 years is called a century, made up of 10 decades.
Every four years, there is one February 29th, one presidential election...