Webster's English Dictionary

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customer

cus.tom.er \'k*s-t*-m*r\ n [ME custumer, fr. custume] 1a: one that 
   purchases a commodity or service usu. systematically or freque ntly 1b: one 
   that patronizes or uses services (as of a restaurant)  2: an often strange 
   or unusual individual {a queer ~}