The Collaborative International Dictionary of English v.0.48:

Percept \Per"cept\ (p[~e]r"s[e^]pt), n. [From L. percipere,
   perceptum.]
   1. That object or phenomenon which is perceived. --Sir W.
      Hamilton.
      [1913 Webster]

   2. The mental result of perceiving; the sensation of
      something perceived; that part of the mental state
      resulting from an act of perception.
      [PJC]

            The modern discussion between percept and concept,
            the one sensuous, the other intellectual. --Max
                                                  M["u]ller.
      [1913 Webster]

WordNet (r) 3.0 (2006):

percept
    n 1: the representation of what is perceived; basic component in
         the formation of a concept [syn: percept, perception,
         perceptual experience]