Source : Webster's Revised Unabridged Dictionary (1913)

Sociability \So`cia*bil"i*ty\, n.[Cf. F. sociabilit['e].]
   The quality of being sociable; sociableness.

Source : WordNet®

sociability
     n : the relative tendency or disposition to be sociable or
         associate with one's fellows [syn: {sociableness}] [ant:
         {unsociability}]