Definitions of dollar:

• noun:   a symbol of commercialism or greed

  Example: "He worships the almighty dollar"

• noun:   a United States coin worth one dollar

  Example: "The dollar coin has never been popular in the United States"

• noun:   a piece of paper money worth one dollar
• noun:   the basic monetary unit in many countries; equal to 100 cents
• name:  A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #4116)