‧pert1 /ˈekspɜːt-ɜːrt/ noun [countable] someone who has a special skill or special knowledge of an area of work or study, usually as the result of many years experienceOne of the functions of the marketing expert in commerce is to develop a clear idea of the target ...
Del Longman Business Dictionarycus‧tom‧er/ˈkʌstəmə-ər/noun[countable]a person ororganizationthat buys goods or services from a shop or companyWe try to keepregular customershappy.thecustomer complaintsdepartment→target customer→ultimate customer ...