noun

• 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.
• (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.)
• (nuclear physics) A unit of reactivity equal to the interval between delayed criticality and prompt criticality.
• A small town in Clackmannanshire council area, Scotland (OS grid ref NS9698)
• An unincorporated community in Coosa County, Alabama, United States.
• A former community in Ontario, Canada, now part of the city of Markham.
• A surname.