Source : Webster's Revised Unabridged Dictionary (1913)

Image \Im"age\, n. [F., fr. L. imago, imaginis, from the root of
   imitari to imitate. See {Imitate}, and cf. {Imagine}.]
   1. An imitation, representation, or similitude of any person,
      thing, or act, sculptured, drawn, painted, or otherwise
      made perceptible to the sight; a visible presentation; a
      copy; a likeness; an effigy; a picture; a semblance.

            Even like a stony image, cold and numb. --Shak.

            Whose is this image and superscription? --Matt.
                                                  xxii. 20.

            This play is the image of a murder done in Vienna.
                                                  --Shak.

            And God created man in his own image. --Gen. i. 27.

   2. Hence: The likeness of anything to which worship is paid;
      an idol. --Chaucer.

            Thou shalt not make unto thee any graven image, . .
            . thou shalt not bow down thyself to them. --Ex. xx.
                                                  4, 5.

   3. Show; appearance; cast.

            The face of things a frightful image bears.
                                                  --Dryden.

   4. A representation of anything to the mind; a picture drawn
      by the fancy; a conception; an idea.

            Can we conceive Image of aught delightful, soft, or
            great?                                --Prior.

   5. (Rhet.) A picture, example, or illustration, often taken
      from sensible objects, and used to illustrate a subject;
      usually, an extended metaphor. --Brande & C.

   6. (Opt.) The figure or picture of any object formed at the
      focus of a lens or mirror, by rays of light from the
      several points of the object symmetrically refracted or
      reflected to corresponding points in such focus; this may
      be received on a screen, a photographic plate, or the
      retina of the eye, and viewed directly by the eye, or with
      an eyeglass, as in the telescope and microscope; the
      likeness of an object formed by reflection; as, to see
      one's image in a mirror.

   {Electrical image}. See under {Electrical}.

   {Image breaker}, one who destroys images; an iconoclast.

   {Image graver}, {Image maker}, a sculptor.

   {Image worship}, the worship of images as symbols; iconolatry
      distinguished from idolatry; the worship of images
      themselves.

   {Image Purkinje} (Physics), the image of the retinal blood
      vessels projected in, not merely on, that membrane.

   {Virtual image} (Optics), a point or system of points, on one
      side of a mirror or lens, which, if it existed, would emit
      the system of rays which actually exists on the other side
      of the mirror or lens. --Clerk Maxwell.

Image \Im"age\, v. t. [imp. & p. p. {Imaged}; p. pr. & vb. n.
   {Imaging}.]
   1. To represent or form an image of; as, the still lake
      imaged the shore; the mirror imaged her figure. ``Shrines
      of imaged saints.'' --J. Warton.

   2. To represent to the mental vision; to form a likeness of
      by the fancy or recollection; to imagine.

            Condemn'd whole years in absence to deplore, And
            image charms he must behold no more.  --Pope.

Source : WordNet®

image
     n 1: an iconic mental representation; "her imagination forced
          images upon her too awful to contemplate" [syn: {mental
          image}]
     2: a visual representation (of an object or scene or person or
        abstraction) produced on a surface; "they showed us the
        pictures of their wedding"; "a movie is a series of images
        projected so rapidly that the eye integrates them" [syn: {picture},
         {icon}, {ikon}]
     3: (Jungian psychology) a personal facade that one presents to
        the world; "a public image is as fragile as Humpty Dumpty"
        [syn: {persona}]
     4: a standard or typical example; "he is the prototype of good
        breeding"; "he provided America with an image of the good
        father" [syn: {prototype}, {paradigm}, {epitome}]
     5: language used in a figurative or nonliteral sense [syn: {trope},
         {figure of speech}, {figure}]
     6: someone who closely resembles a famous person (especially an
        actor); "he could be Gingrich's double"; "she's the very
        image of her mother" [syn: {double}, {look-alike}]
     7: a representation of a person (especially in the form of
        sculpture); "the coin bears an effigy of Lincoln"; "the
        emperor's tomb had his image carved in stone" [syn: {effigy},
         {simulacrum}]

image
     v : imagine; conceive of; see in one's mind; "I can't see him on
         horseback!"; "I can see what will happen"; "I can see a
         risk in this strategy" [syn: {visualize}, {visualise}, {envision},
          {project}, {fancy}, {see}, {figure}, {picture}]

Source : Free On-Line Dictionary of Computing

image
     
        1.  Data representing a two-dimensional scene.
        A digital image is composed of {pixels} arranged in a
        rectangular array with a certain height and width.  Each pixel
        may consist of one or more {bit}s of information, representing
        the brightness of the image at that point and possibly
        including colour information encoded as {RGB} triples.
     
        {Images} are usually taken from the real world via a {digital
        camera}, {frame grabber}, or {scanner}; or they may be
        generated by computer, e.g. by {ray tracing} software.
     
        See also {image formats}, {image processing}.
     
        (1994-10-21)
     
        2.  The image (or range) of a {function} is the
        set of values obtained by applying the function to all
        elements of its {domain}.  So, if f : D -> C then the set f(D)
        = \{ f(d) | d in D \} is the image of D under f.  The image is
        a subset of C, the {codomain}.
     
        (2000-01-19)