mail (Noun) — The bags of letters and packages that are transported by the postal service.
mail (Noun) — The system whereby messages are transmitted via the post office. ex. "the mail handles billions of items every day" ex. "he works for the United States mail service"
mail (Noun) — A conveyance that transports the letters and packages that are conveyed by the postal system.
mail (Noun) — Any particular collection of letters or packages that is delivered. ex. "your mail is on the table"
mail (Noun) — (Middle Ages) flexible armour made of interlinked metal rings.
mail (Noun) — (computing) a system of electronic message communication via network, esp. the Internet; a message or messages sent or received this way. ex. "you cannot send packages by electronic mail"
mail (Verb) — Send via the postal service. ex. "I'll mail you the check tomorrow"
mail (Verb) — Give to a courier to take to another place. ex. "I'll mail you the paper when it's written"
mail (Verb) — (computing) communicate electronically on the computer. ex. "she e-mailed me the good news"