Source : Webster's Revised Unabridged Dictionary (1913)

Perception \Per*cep"tion\, n. [L. perceptio: cf. F. perception.
   See {Perceive}.]
   1. The act of perceiving; cognizance by the senses or
      intellect; apperhension by the bodily organs, or by the
      mind, of what is presented to them; discernment;
      apperhension; cognition.

   2. (Metaph.) The faculty of perceiving; the faculty, or
      peculiar part, of man's constitution by which he has
      knowledge through the medium or instrumentality of the
      bodily organs; the act of apperhending material objects or
      qualities through the senses; -- distinguished from
      conception. --Sir W. Hamilton.

            Matter hath no life nor perception, and is not
            conscious of its own existence.       --Bentley.

   3. The quality, state, or capability, of being affected by
      something external; sensation; sensibility. [Obs.]

            This experiment discovereth perception in plants.
                                                  --Bacon.

   4. An idea; a notion. [Obs.] --Sir M. Hale.

   Note: ``The word perception is, in the language of
         philosophers previous to Reid, used in a very extensive
         signification. By Descartes, Malebranche, Locke,
         Leibnitz, and others, it is employed in a sense almost
         as unexclusive as consciousness, in its widest
         signification. By Reid this word was limited to our
         faculty acquisitive of knowledge, and to that branch of
         this faculty whereby, through the senses, we obtain a
         knowledge of the external world. But his limitation did
         not stop here. In the act of external perception he
         distinguished two elements, to which he gave the names
         of perception and sensation. He ought perhaps to have
         called these perception proper and sensation proper,
         when employed in his special meaning.'' --Sir W.
         Hamilton.

Source : WordNet®

perception
     n 1: the representation of what is perceived; basic component in
          the formation of a concept [syn: {percept}, {perceptual
          experience}]
     2: a way of conceiving something; "Luther had a new perception
        of the Bible"
     3: the process of perceiving
     4: knowledge gained by perceiving; "a man admired for the depth
        of his perception"
     5: becoming aware of something via the senses [syn: {sensing}]