dollar🔊

Official designation for currency in some parts of the world, including Canada, the United States, Australia, New Zealand, Hong Kong, and elsewhere. Its symbol is $. +

(by extension) Money generally.

(UK, colloquial, historical) A quarter of a pound or one crown, historically minted as a coin of approximately the same size and composition as a then-contemporary dollar coin of the United States, and worth slightly more.

(historical) Imported from the United States, and paid for in U.S. dollars.

(nuclear physics) A unit of reactivity equal to the interval between delayed criticality and prompt criticality.