The Collaborative International Dictionary of English v.0.48:

Mail \Mail\, v. t.
   1. To arm with mail.
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   2. To pinion. [Obs.]
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The Collaborative International Dictionary of English v.0.48:

Mail \Mail\ (m[=a]l), n. [OE. male bag, OF. male, F. malle bag,
   trunk, mail, OHG. malaha, malha, wallet; akin to D. maal,
   male; cf. Gael. & Ir. mala, Gr. molgo`s hide, skin.]
   1. A bag; a wallet. [Obs.] --Chaucer.
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   2. The bag or bags with the letters, papers, or other matter
      contained therein, conveyed under public authority from
      one post office to another; the whole system of appliances
      used by government in the conveyance and delivery of mail
      matter.
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            There is a mail come in to-day, with letters dated
            Hague.                                --Tatler.
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   3. That which comes in the mail; letters, etc., received
      through the post office.
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   4. A trunk, box, or bag, in which clothing, etc., may be
      carried. [Obs.] --Sir W. Scott.
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   Mail catcher, an iron rod, or other contrivance, attached
      to a railroad car for catching a mail bag while the train
      is in motion.

   Mail guard, an officer whose duty it is to guard the public
      mails. [Eng.]

   Mail train, a railroad train carrying the mail.
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The Collaborative International Dictionary of English v.0.48:

Mail \Mail\ (m[=a]l), n.
   A spot. [Obs.]
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The Collaborative International Dictionary of English v.0.48:

Mail \Mail\, n. [F. maille, OF. also maaille, LL. medalia. See
   Medal.]
   1. A small piece of money; especially, an English silver
      half-penny of the time of Henry V. [Obs.] [Written also
      maile, and maille.]
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   2. Rent; tribute. [Obs., except in certain compounds and
      phrases, as blackmail, mails and duties, etc.]
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   Mail and duties (Scots Law), the rents of an estate, in
      whatever form paid.
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The Collaborative International Dictionary of English v.0.48:

Mail \Mail\ (m[=a]l), n. [OE. maile, maille, F. maille a ring of
   mail, mesh, network, a coat of mail, fr. L. macula spot, a
   mesh of a net. Cf. Macle, Macula, Mascle.]
   1. A flexible fabric made of metal rings interlinked. It was
      used especially for defensive armor. --Chaucer.
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   Chain mail, Coat of mail. See under Chain, and Coat.
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   2. Hence generally, armor, or any defensive covering.
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   3. (Naut.) A contrivance of interlinked rings, for rubbing
      off the loose hemp on lines and white cordage.
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   4. (Zool.) Any hard protective covering of an animal, as the
      scales and plates of reptiles, shell of a lobster, etc.
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            We . . . strip the lobster of his scarlet mail.
                                                  --Gay.
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The Collaborative International Dictionary of English v.0.48:

Mail \Mail\, v. t. [imp. & p. p. Mailed; p. pr. & vb. n.
   Mailing.]
   To deliver into the custody of the postoffice officials, or
   place in a government letter box, for transmission by mail;
   to post; as, to mail a letter. [U. S.]
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   Note: In the United States to mail and to post are both in
         common use; as, to mail or post a letter. In England
         post is the commoner usage.
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WordNet (r) 3.0 (2006):

mail
    n 1: the bags of letters and packages that are transported by
         the postal service
    2: the system whereby messages are transmitted via the post
       office; "the mail handles billions of items every day"; "he
       works for the United States mail service"; "in England they
       call mail `the post'" [syn: mail, mail service, postal
       service, post]
    3: a conveyance that transports the letters and packages that
       are conveyed by the postal system
    4: any particular collection of letters or packages that is
       delivered; "your mail is on the table"; "is there any post
       for me?"; "she was opening her post" [syn: mail, post]
    5: (Middle Ages) flexible armor made of interlinked metal rings
       [syn: chain mail, ring mail, mail, chain armor,
       chain armour, ring armor, ring armour]
    v 1: send via the postal service; "I'll mail you the check
         tomorrow" [syn: mail, get off]
    2: cause to be directed or transmitted to another place; "send
       me your latest results"; "I'll mail you the paper when it's
       written" [syn: mail, post, send]

The Free On-line Dictionary of Computing (19 January 2023):

mail

    1. electronic mail.

   2. The Berkeley Unix program for composing and reading
   electronic mail.  It normally uses sendmail to handle
   delivery.

   Unix manual page: mail(1)

   (1997-12-03)