Psy*chol"o*gy (?), n. pl.
Psychologies (?). [Psycho- + -logy:
cf. F. psychologie. See Psychical.] The science of
the human soul; specifically, the systematic or scientific knowledge
of the powers and functions of the human soul, so far as they are
known by consciousness; a treatise on the human soul.
Psychology, the science conversant about the
phenomena of the mind, or conscious subject, or self.
Sir W. Hamilton.