Source : Webster's Revised Unabridged Dictionary (1913)

Neighborliness \Neigh"bor*li*ness\, n.
   The quality or state of being neighborly.

Source : WordNet®

neighborliness
     n : a disposition to be friendly and helpful to neighbors [syn:
         {neighbourliness}, {good-neighborliness}, {good-neighbourliness}]
         [ant: {unneighborliness}]