Englishfor English speakers
customer
Noun
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A customer is a person who pays money for goods or services.
The restaurant had to close because there weren't enough customers.
specialization
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noun
the act of specializing; making something suitable for a special purpose
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noun
(= specialisation)
the special line of work you have adopted as your career
his specialization is gastroenterology
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noun
(= differentiation)
(biology) the structural adaptation of some body part for a particular function
cell differentiation in the developing embryo