first class adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of first class adverb from the Oxford Advanced American Dictionary

first class

adverb

1using the best and most expensive seats or rooms in a plane, train, or ship to travel first class

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2by the class of mail that is used for letters I sent the package first class on Monday.

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