what is a quarter dollar?
<answer> The quarter dollar is a U.S. coin with a denomination worth 25 cents, or one-fourth of a dollar. <context> Three Different United States Quarter Dollars. The quarter (short for quarter dollar) is a U.S. coin with a denomination worth 25 cents, or 1/4 of a dollar; the formal name of this coin is a quarter dollar.. It has a diameter of 24.26mm (0.955 inches) and a nominal thickness of 1.75mm (0.069 inches).