Webster's English Dictionary

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psychology

psy.chol.o.gy \-je-\ n [NL psychologia, fr. psych- + -logia -logy] often 
   attrib  1: the science of mind and behavior  2a: the mental or behavioral 
   characteristics of an individual or group  2b: the study of mind and 
   behavior in relation to a particular field of kno wledge or activity 3: a 
   treatise on psychology