[first-class(1)] {adj.} 1. Of the highest class or best kind;excellent; first-rate.

Jane did a first-class job of repairing thecoat.

It was a first-class TV program.

Compare: TOP-NOTCH. 2. Ofthe best or most expensive class of travelling.

Mr. Jones bought afirst-class plane ticket to Chicago.

3. Belonging to the class ofmail for sending letters, post cards, and handwritten or typewrittenmail that is sealed.

It is expensive to send a heavy letter byfirst-class mail.