extrovert

from WordNet (r) 3.0 (2006)

extrovert
    adj 1: being concerned with the social and physical environment
           [syn: {extrovert}, {extravert}, {extroverted},
           {extraverted}, {extrovertive}, {extravertive}]
    n 1: (psychology) a person concerned more with practical
         realities than with inner thoughts and feelings [syn:
         {extrovert}, {extravert}] [ant: {introvert}]

from The Collaborative International Dictionary of English v.0.48

extrovert \extrovert\ n. (Psychol.)
   A person who is extroverted; a person who is marked by an
   interest in others or concerned primarily with external
   reality. Contrasted with {introvert}.
   [WordNet 1.5 +PJC] extroverted