sociableness

from WordNet (r) 3.0 (2006)

sociableness
    n 1: the relative tendency or disposition to be sociable or
         associate with one's fellows [syn: {sociability},
         {sociableness}] [ant: {unsociability}, {unsociableness}]

from The Collaborative International Dictionary of English v.0.48

Sociableness \So"cia*ble*ness\, n.
   The quality of being sociable.
   [1913 Webster]

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