n. n. A silver coin of the United States containing 371.25 grains of silver and 41.25 grains of alloy, that is, having a total weight of 412.5 grains.n. A gold coin of the United States containing 23.22 grains of gold and 2.58 grains of alloy, that is, having a total weight of 25.8 grains, nine-tenths fine. It is no longer coined.n. A coin of the same general weight and value as the United States silver dollar, though differing slightly in different countries, formerly current in Mexico, Canada, parts of South America, also in Spain, and several other European countries.n. The value of a dollar; the unit of currency, differing in value in different countries, commonly employed in the United States and a number of other countries, including Australia, Canada, Hong Kong, parts of the Carribbean, Liberia, and several others.