a way of travelling on a train or ship that costs less and is less comfortable than first class. In the UK this is now usually called standard class.
(in the UK) the class of mail that costs less and takes longer to arrive than first class
Example:
- Second class is cheaper.
(in the US) the system of sending newspapers and magazines by mail
the second highest standard of degree given by a British university, often divided into upper second class and lower second class