[1] : The Collaborative International Dictionary of English v.0.48

mailbox \mail"box`\ n.
   1. a public box for deposit of mail, where it is later picked
      up by the postal authority for delivery.

   syn: postbox, letter box.
        wordnet 1.5

   2. a private box to recieve delivery of mail. the term is
      used both for boxes receiving mail delivered by the public
      postal authority, or by a private services, such as for
      mail to employees in large corporations.

   syn: letter box.
        wordnet 1.5 +pjc

   3. computers a location within a computer storage device
      where electronic mail is held until it is retrieved by the
      addressee. creation and use of an electronic mailbox
      requires special software as well as a data storage
      device.
      pjc

[2] : WordNet (r) 2.0

mailbox
     n 1: a private box for delivery of mail syn: letter box
     2: public box for deposit of mail syn: postbox, letter box
see also:
letter box postbox 

[3] : The Free On-line Dictionary of Computing (27 SEP 03)

mailbox
     
        1.  a file belonging to a particular user on a
        particular computer in which received electronic mail
        messages are stored ready for the user to read them.  a
        mailbox may be just an electronic mail address to which
        messages are sent and may not actually correspond to a file if
        the messages are processed automatically, e.g. a mail server
        or mailing list.
     
        2.  a destination for interprocess messages in a
        message passing system.  a mailbox is a message queue,
        usually stored in the memory of the processor on which the
        receiving process is running.  primitives are provided for
        sending a message to a named mailbox and for reading messages
        from a mailbox.
     
        1994-10-20
     
     
see also:
electronic mail electronic mail address mail server mailing list message passing message 
primitives 

Mailbox >> M Words
Mailbox, definition of term: Mailbox
mailbox_pag1.html