dollar

[dol-er]
noun
1.
a paper money, silver or cupronickel coin, and monetary unit of the United States, equal to 100 cents. Symbol: $
2.
a silver or nickel coin and monetary unit of Canada, equal to 100 cents. Symbol: $
3.
any of the monetary units of various other nations, as Australia, the Bahamas, Barbados, Belize, Bermuda, Fiji, Guyana, Hong Kong, Jamaica, Liberia, New Zealand, Singapore, the Solomon Islands, Trinidad and Tobago, and Zimbabwe, equal to 100 cents.
4.
Also called ringgit. a cupronickel coin and monetary unit of Brunei, equal to 100 sen.
5.
ringgit ( def 1 ).
6.
a thaler.
7.
a peso.
9.
yuan ( def 1 ).
10.
British Slang.
a.
five-shilling piece; crown.
b.
the sum of five shillings.

Origin:
1545–55; earlier daler < Low German, Dutch daler; cognate with German Taler, short for Joachimsthaler coin minted in Joachimsthal in Bohemia

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dollar (ˈdɒlə)
 
n
1.  the standard monetary unit of the US and its dependencies, divided into 100 cents
2.  the standard monetary unit, comprising 100 cents, of the following countries or territories: Antigua and Barbuda, Australia, the Bahamas, Barbados, Belize, Bermuda, the British Virgin Islands, Brunei, Canada, the Cayman Islands, Dominica, East Timor, Ecuador, El Salvador, Fiji, Grenada, Guatemala, Guyana, Hong Kong, Jamaica, Kiribati, Liberia, Malaysia, the Marshall Islands, Micronesia, Namibia, Nauru, New Zealand, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Singapore, Solomon Islands, Taiwan, Trinidad and Tobago, Tuvalu, and Zimbabwe
3.  informal (Brit) (formerly) five shillings or a coin of this value
4.  informal look or feel (like) a million dollars to look or feel extremely well
 
[C16: from Low German daler, from German Taler, Thaler, short for Joachimsthaler coin made from metal mined in Joachimsthal Jachymov, town now in the Czech Republic]

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Etymonline
Word Origin & History

dollar
1553, from Low Ger. daler, from Ger. taler (1540, later thaler), abbrev. of Joachimstaler, lit. "(gulden) of Joachimstal," coin minted 1519 from silver from mine opened 1516 near Joachimstal, town in Erzgebirge Mountains in northwest Bohemia. Ger. Tal is cognate with Eng.
dale. Ger. thaler was a large silver coin of varying value in the Ger. states (and a unit of the Ger. monetary union of 1857-73 equal to three marks); it was also a currency unit in Denmark and Sweden. Eng. colonists in America used the word in ref. to Spanish pieces of eight. Continental Congress July 6, 1785, adopted dollar when it set up U.S. currency, on suggestion of Gouverneur Morris and Thomas Jefferson, because the term was widely known but not British. But none were actually used until 1794. The dollar sign ($) is said to derive from the image of the Pillars of Hercules, stamped with a scroll, on the Spanish piece of eight. Phrase dollars to doughnuts attested from 1890; dollar diplomacy is from 1910.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
When freedom came, he was still in debt to his master some three hundred
  dollars.
The endeavor surprised music lovers and raised thousands of dollars.
The show has grossed over half a billion dollars worldwide.
It arrived in a plain brown package by registered mail, insured for one million
  dollars.
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