/ ˈkʌstəmə(r); NAmE / noun
1.
a person or an organization that buys sth from a shop / store or business :
one of the shop's best / biggest customers
They know me—I'm a regular customer .
the customer service department
The firm has excellent customer relations.
2.
( old-fashioned , informal ) used after an adjective to describe a particular type of person :
an awkward customer