First class post is the faster and dearer way of sending mail. Send it first class post, a first class post stamp.
It aims to arrive the next working day, which it manages most of the time. First class post is worth the difference only when a day actually matters.
1nounfirst class postThe faster and dearer way of sending mail.
“The application went by first class post on the Thursday.”
first class post is a service.
Practised in Bank & Post Office