Allport spelled out 49 definitions of personality as used in theology, philosophy, law, sociology, and psychology. He then offered a 50th definition, which in 1937 was “the dynamic organization within the individual of those psychophysical systems that deter mine his unique adjustments to his environment” (Allport, 1937, p. 48). In 1961, he had changed the last phrase to read “that determine his characteristic behavior and thought”