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Definition of: first-class
(fûrst′klas′, -kläs′) adjective
1. Belonging to the first class; of the highest rank or the best quality.
2. Consisting of sealed letters or other sealed matter transmitted by the post: first-class mail.
3. Pertaining to, for, or using, the most luxurious accommodations on a steamer, train, plane, etc.
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