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The Collaborative International Dictionary of English v.0.48:

Psychology \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. [1913 Webster] Psychology, the science conversant about the phenomena of the mind, or conscious subject, or self. --Sir W. Hamilton. [1913 Webster]