/ ˈkɒmɜːs; NAmE ˈkɑːmɜːrs/ noun
[ U ] trade, especially between countries; the buying and selling of goods and services :
leaders of industry and commerce
—see also Chamber of Commerce
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WORD ORIGIN
mid 16th cent. originally in the sense of social interaction between people: from French , or from Latin commercium trade, trading, from com- together + mercium (from merx , merc- merchandise).