extroversion

from WordNet (r) 3.0 (2006)

extroversion
    n 1: (psychology) an extroverted disposition; concern with what
         is outside the self [syn: {extraversion}, {extroversion}]
         [ant: {ambiversion}, {introversion}]

from The Collaborative International Dictionary of English v.0.48

extroversion \ex`tro*ver"sion\, n. [See {Extrorse}.]
   1. The condition of being turned wrong side out; as,
      extroversion of the bladder. --Dunglison.
      [1913 Webster]

   2. (Psychol.) the trait of being interested primarily in
      things in one's external environement, rather than one's
      own thoughts and feelings.
      [PJC]

   3. (Psychol.) the act of directing one's interests primarily
      toward things in one's external environement, rather than
      one's own thoughts and feelings.
      [PJC]

from Moby Thesaurus II by Grady Ward, 1.0

45 Moby Thesaurus words for "extroversion":
      accessibility, ambiversion, approachability, candor,
      communicativeness, complexion, conversableness,
      cycloid personality, cyclothymia, ectomorphism, ectomorphy,
      endomorphism, endomorphy, extrovertedness, frankness, freeness,
      humor, ingoingness, introversion, introvertedness, mesomorphism,
      mesomorphy, openness, other-directedness, outgoingness,
      outspokenness, personality tendency, plainness, plainspokenness,
      schizoid personality, schizothymia, sociability, somatotype,
      syntony, talkativeness, unconstraint, unrepression, unreserve,
      unreservedness, unrestraint, unrestriction, unreticence,
      unsecretiveness, unsuppression, untaciturnity