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A personality trait discovered through factor analysis, associated with light-heartedness and freedom from worry; hence, the state or condition of being optimistic and carefree. The term was introduced by the US psychologist J(oy) P(aul) Guilford (1897–1987) and a co-author in an article in the Journal of Psychology in 1936. [From Greek rhathymia freedom from care]

Subjects: Psychology.

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