Learner's definition of DOLLAR
1 a : a basic unit of money in the U.S., Canada, Australia, and other countries that is equal to 100 cents
b : a bill or coin that is worth one dollar
The shirt costs 20 dollars. [=$20]
She had to pay hundreds of dollars in auto repairs.
The property is worth a million dollars. = It's a million-dollar property.
Do you have a 20-dollar bill? [=a twenty]
It costs 500 pesos. How much is that in dollars? [=how many dollars equals 500 pesos?]
2 the dollar technical : the value of a dollar when it is compared to another unit of money
The dollar dropped sharply against the pound.
the strength/weakness of the dollar
The dollar is worth more in Mexico.
3 [count] : money that is from a specified source or used for a specified purpose — usually plural
Should a program like this be paid for with tax/taxpayer dollars? [=with money the government collects through taxes]
tourist/tourism dollars [=money that an economy gets because of the money tourists spend there]
The company needs to invest its advertising dollars wisely.
look/feel like a million dollars