dollar

1. (numismatics) Official designation for currency in some parts of the world, including Canada, the United States, Australia, New Zealand, Singapore, Hong Kong, and elsewhere. Its symbol is $.Examples: "But poverty’s scourge is fiercest below $1.25 (the average of the 15 poorest countries’ own poverty lines, measured in 2005 dollars and adjusted for differences in purchasing power): people below that level live lives that are poor, nasty, brutish and short."; "Yeah, but why? Lincoln doesn’t need the penny for notoriety. He’s everywhere. We put him on novelty bandages, cup-and-ball games, and creepy Chia Pets. And you know where else we put him? The five-dollar bill! You know, the thing that’s worth 500 times more than the penny!"; "The value of the peso has plummeted 858% against the US dollar over the past five years as the central bank printed more of the currency to help the country’s spendthrift government avoid defaulting on its debts. […] There’s another significant snag in Milei’s plan: Argentina doesn’t have enough dollars to ditch the peso."Synonyms: buck, smackeroo

2. (by extension) Money generally.Examples: "Television, a favored source of news and information, pulls the largest share of advertising monies. In 1935, newspapers received 45 percent of the advertising dollar, magazines 8 percent, and radio 7 percent."broadly

3. (by extension, Malaysia, colloquial) A ringgit, a unit of currency in Malaysia.Malaysiabroadlycolloquial

4. (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.UKcolloquialhistorical

5. (attributive, historical) Imported from the United States, and paid for in U.S. dollars. (Note: distinguish "dollar wheat", North American farmers' slogan, meaning a market price of one dollar per bushel.)Examples: "The restricted purchase of dollar tobacco will, we hope, have the effect of increasing the imports of Turkish and Grecian tobacco"; "For there are two luxury imports that lead all the others: dollar films and dollar tobacco."attributivehistorical

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