"dollar" in the noun sense
1. dollar
the basic monetary unit in many countries equal to 100 cents
2. dollar, dollar bill, one dollar bill, buck, clam
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"
Source: WordNet® (An amazing lexical database of English)
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