Psychology is the science dealing with the mind and with mental and emotional processes. It is the science of human and animal behaviour. The human psyche has always mystified and enthralled man since ages. Today, psychology is probably one of the most sought after branch of study. The book at hand has been made with an aim to acquaint the students and experts and everyone related to the field with the various modern and traditional terms used in this branch of study. It has been our sincere effort to make the book as interesting as possible by introducing pictures wherever the necessity has been felt and the word arrangement has been made alphabetically so that the reader does not find any difficulty in his search. We have even put the origin of the respective psychology terms like some words are derived from Greek, some from Latin as so on, in accordance to the requirement of the book. The book will without doubt be an invaluable addition to the library to the reader.