Noun:
1: dollar the basic monetary unit in many countries; equal to 100 cents
2: clam, one dollar bill, buck, dollar, dollar bill a piece of paper money worth one dollar
3: dollar a United States coin worth one dollar; "the dollar coin has never been popular in the United States"
4: dollar, dollar mark, dollar sign a symbol of commercialism or greed; "he worships the almighty dollar"; "the dollar sign means little to him"