NOUN (2)

1. polished surface that forms images by reflecting light;

2. a faithful depiction or reflection;
- Example: "the best mirror is an old friend"


VERB (2)

1. reflect as if in a mirror;
- Example: "The smallest pond at night mirrors the firmament above"

2. reflect or resemble;
- Example: "The plane crash in Milan mirrored the attack in the World Trade Center"

The Collaborative International Dictionary of English v.0.48:

Mirror \Mir"ror\, v. t. [imp. & p. p. Mirrored; p. pr. & vb.
   n. Mirroring.]
   1. To reflect, as in a mirror.
      [1913 Webster]

   2. To copy or duplicate; to mimic or imitate; as, the files
      at Project Gutenberg were mirrored on several other ftp
      sites around the world.
      [PJC]

   3. To have a close resemblance to; as, his opinions often
      mirrored those of his wife.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Mirror \Mir"ror\, n. [OE. mirour, F. miroir, OF. also mireor,
   fr. (assumed) LL. miratorium, fr. mirare to look at, L.
   mirari to wonder. See Marvel, and cf. Miracle,
   Mirador.]
   [1913 Webster]
   1. A looking-glass or a speculum; any glass or polished
      substance that forms images by the reflection of rays of
      light.
      [1913 Webster]

            And in her hand she held a mirror bright,
            Wherein her face she often view[`e]d fair.
                                                  --Spenser.
      [1913 Webster]

   2. That which gives a true representation, or in which a true
      image may be seen; hence, a pattern; an exemplar.
      [1913 Webster]

            She is mirour of all courtesy.        --Chaucer.
      [1913 Webster]

            O goddess, heavenly bright,
            Mirror of grace and majesty divine.   --Spenser.
      [1913 Webster]

   3. (Zool.) See Speculum.
      [1913 Webster]

   Mirror carp (Zool.), a domesticated variety of the carp,
      having only three or fur rows of very large scales side.


   Mirror plate.
      (a) A flat glass mirror without a frame.
      (b) Flat glass used for making mirrors.

   Mirror writing, a manner or form of backward writing,
      making manuscript resembling in slant and order of letters
      the reflection of ordinary writing in a mirror. The
      substitution of this manner of writing for the common
      manner is a symptom of some kinds of nervous disease.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mirror
    n 1: polished surface that forms images by reflecting light
    2: a faithful depiction or reflection; "the best mirror is an
       old friend"
    v 1: reflect as if in a mirror; "The smallest pond at night
         mirrors the firmament above"
    2: reflect or resemble; "The plane crash in Milan mirrored the
       attack in the World Trade Center"

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

mirror
mirroring

   1.  Writing duplicate data to more than one
   device (usually two hard disks), in order to protect against
   loss of data in the event of device failure.  This technique
   may be implemented in either hardware (sharing a disk
   controller and cables) or in software.  It is a common
   feature of RAID systems.

   Several operating systems support software disk mirroring or
   disk-duplexing, e.g. Novell NetWare.

   See also Redundant Array of Independent Disks.

   Interestingly, when this technique is used with magnetic
   tape storage systems, it is usually called "twinning".

   A less expensive alternative, which only limits the amount of
   data loss, is to make regular backups from a single disk to
   magnetic tape.

   2. mirror site.

   (1998-06-11)