Source : Webster's Revised Unabridged Dictionary (1913)

Extroversion \Ex`tro*ver"sion\, n. [See {Extrorse}.]
   The condition of being turned wrong side out; as,
   extroversion of the bladder. --Dunglison.

Source : WordNet®

extroversion
     n : (psychology) an extroverted disposition; concern with what
         is outside the self [syn: {extraversion}] [ant: {introversion},
          {ambiversion}]