Simple Definition of second class
: a level of service on a train, ship, etc., that is just below first class
: a class of mail in the U.S. that includes newspapers, magazines, etc.
: a class of mail in the UK that costs less and takes longer to arrive than first class
Full Definition of second class
1 : the second and usually next to highest group in a classification
2 : cabin class
3 : a class of United States or Canadian mail comprising periodicals sent to regular subscribers
Examples of second class
The airline offers special services for travelers in first and second class.
She got an upper second class in English at Oxford.
First Known Use of second class
Seen and Heard
What made you want to look up second class? Please tell us where you read or heard it (including the quote, if possible).