top-quality or most expensive
ExampleShe is a first-class accountant.
(the type of travel or type of hotel which is most expensive and comfortable
Examplesto travel first-class • First-class travel provides the best service. • A first-class ticket to New York costs more than I can afford. • The MD prefers to stay in first-class hotels.

Mentioned in these terms

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Mumbai Interbank Offered Rate (MIBOR) first-class mail