noun
[noncount] Mail is used in British English but it is much more common in U.S. English. The usual word in British English is post.
the system used for sending letters and packages from one person to another
letters or packages sent from one person to another
e-mail
the mails
chiefly US law formal :the system used for sending letters, packages, etc. :a nation's postal system
verb
mails; mailed; mailing
[+ obj] chiefly US :to send (something, such as a letter or package) by mail
noun
[noncount] :a kind of protective clothing (called armor) that is made of many small pieces or rings of metal which are linked together