Definition of "Mail" :

noun: (Middle Ages) flexible armor made of interlinked metal rings

noun: a conveyance that transports the letters and packages that are conveyed by the postal system

noun: the system whereby messages are transmitted via the post office

"The mail handles billions of items every day."

noun: the bags of letters and packages that are transported by the postal service

noun: any particular collection of letters or packages that is delivered

"Your mail is on the table."

verb: cause to be directed or transmitted to another place

"I'll mail you the paper when it's written."

verb: send via the postal service

"I'll mail you the check tomorrow."