Definition of mail (Entry 2 of 4)
2a
: material (such as letters and packages) sent or carried in a postal system
sorting through the mail
also
: similar material distributed within an organization
interoffice mail
b
: a conveyance that transports mail
c
: e-mail sense 2a
3
: a nation's postal system
a letter sent through the mail
—often used in plural packages sent through the mails
mailed;
mailing;
mails
Definition of mail (Entry 3 of 4)
: to send by mail : post
Definition of mail (Entry 4 of 4)
1
: armor made of metal links or sometimes plates
2
: a hard enclosing covering of an animal (such as a tortoise)
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