a person who purchases goods or services from another; buyer; patron.
Informal. a person one has to deal with: a tough customer; a cool customer.

1400–50; late Middle English; see custom, -er1; compare Middle English customer collector of customs < Anglo-French; Old French costumier, cognate with Medieval Latin custumārius; see customary Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
customer (ˈkʌstəmə)
1.  a person who buys
2.  informal a person with whom one has dealings: a cool customer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

14c., "customs official;" later "buyer" (early 15c.), from Anglo-Fr. custumer, from M.L. custumarius, from L. consuetudinarius (see custom). More generalized meaning "a person with whom one has dealings" emerged 1540s; that of "a person to deal with" (usually wth an adjective,
tough, etc.) is by 1580s. In Shakespeare, the word also can mean "prostitute."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Her creations have also inspired customers to duplicate her designs or make up
  their own.
Customers have obviously had no trouble finding them.
Now a whole new set of customers is discovering sport kiting.
It is the reproof to a landlord who serves his customers with bad wine.
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