1. the basic unit of money in the United States, Canada, Australia, and several other countries
2. a paper bill or coin worth one dollar

Examples

• The book costs ten dollars.
• She found a dollar on the sidewalk.
• Gas prices rose to four dollars per gallon.
• He paid with a twenty-dollar bill.
• The Canadian dollar is worth less than the US dollar.
• I need to exchange my euros for dollars.
• The vending machine only accepts dollar coins.