extraversion

From New Latin extrāversio, from Classical Latin extrā- (“outside”) + versio (“a turning”). Equivalent to extravert +‎ -sion. Popularized as a psychological term by the German works of Carl Jung.

extraversion (countable and uncountable, plural extraversions)

1. Alternative spelling of extroversion
   • 1675, Robert Boyle, “Of the Imperfection of the Chymist's Doctrine of Qualities”, in The Mechanical Origine or Production of Corrosiveness and Corrosibility, page 36:

     ...the supposed Extraversion or Intraversion of Sulphur...

   • 1915, Carl Jung, “On Psychological Understanding”, in Journal of Abnormal Psychology, number 9, page 396:

     I called the hysterical type the extraversion type and the psychasthénic type the introversion type.

Technical papers in psychology still prefer the variant extraversion used by Carl Jung, although the spelling extroversion is more common in general use.

• extraversive, extravert, extraverted

• “extraversion, n.”, in OED Online ⁠, Oxford, Oxfordshire: Oxford University Press, 1894.

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extraversion f (plural extraversions)

1. extroversion

• “extraversion”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.