Psychologist differ among themselves as to the meaning of personality. Most agree that the word "personality" originated from the Latin persona , which referred to a theatrical mask worn by Roman actors in Greek dramas. These ancient Roman actors wore a mask (persona) to project a role or false appearance. This surface view of personality , of course, is not an acceptable definition. When psychologists use the term "personality" they are referring to something more than the role people play.
However, personality theorists have not agreed on a single definition of personality. Indeed, they evolved unique and vital theories because they lacked agreement as to the nature of humanity, and because each saw personality from an individual reference point. The personality theorists discussed in this book have had a variety of backgrounds. Some were born in Europe and lived their entire lives there; others were born in Europe, but migrated to other parts of the world, especially the United State; still others were born in North America and remained there. Many were influenced by early religious experiences; others were not. Most, but not all, have been trained in either psychiatry or psychology.Many have drawn on their experiences as psychotherapists; others have relied more on empirical research to gather data on human personality. Although they have all dealt in some way with what we call personality, each has approached this global concept from a different perspective. Some have tried to construct a comprehensive theory; others have been less ambitious and have dealt with only a few aspects of personality. Few personality theorist have formally defined personality, but all have had their own view of it.
Althought no single definition is acceptable to all personality theorists, we can say that personality is a pattern of relatively permanent traits and unique characteristics that give both consistency and individuality to a person's behavior. Traits contribute to individual differences in behavior, consistency of behavior over time, and stability of behavior across situations. Traits may be unique, common to some group, or shared by the entire species, but their pattern is different for each individual. Thus each person, though like others in some ways, has a unique personality. Characteristics are unique qualities of an individual that include such attributes as temperament, physique, and intelligence.