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an interchange of goods or commodities, especially on a large scale between different countries (foreign commerce) or between different parts of the same country (domestic commerce) trade; business.
social relations, especially the exchange of views, attitudes, etc.
sexual intercourse.
intellectual or spiritual interchange; communion.
(initial capital letter) . Also called Commerce Department. Informal. the Department of Commerce.

1530–40; < Middle French < Latin commercium, equivalent to commerc(ārī) to trade together (com- com- + mercārī to buy, deal, derivative of merc-, stem of merx goods) + -ium -ium

1. See trade.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
commerce (ˈkɒmɜːs)
1.  the activity embracing all forms of the purchase and sale of goods and services
2.  social relations and exchange, esp of opinions, attitudes, etc
[C16: from Latin commercium trade, from commercārī, from mercārī to trade, from merx merchandise]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s, from M.Fr. commerce, from L. commercium "trade, trafficking," from com- "together" + merx (gen. mercis) "merchandise" (see market).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Navigable waterways are defined as watercourses that have been or may be used for transport of interstate or foreign commerce.
Under that law, it is illegal to use telephone lines in interstate or foreign commerce to place sports bets.
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