Meaning of “mail” - Learner’s Dictionary

mail

noun [ U ] us uk /meɪl/
Extra Examples
I can't resist reading other people's mail.Could you forward my mail to me while I'm away?Have I got any mail?It will take ages to sort through all this mail.I haven't had time to open my mail.
LETTERS

A2 also UK post letters and parcels that are brought by post:

We got loads of mail this morning.
SYSTEM also UK post

A2 the system by which letters and parcels are taken and brought:

Send it by mail.
The letter is in the mail.
→ See also email , junk mail , snail mail , surface mail , voice mail

(Definition of “mail noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)