Psychology

psy·chol·o·gy
Pronunciation[sahy-kol-uh-jee]; -noun, plural -gies.
1. the science of the mind or of mental states and processes.
2. the science of human and animal behavior.
[Origin: 1675-85; < NL psȳchologia. See psycho-, -logy]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.