The Collaborative International Dictionary of English v.0.48:

Reciprocality \Re*cip`ro*cal"i*ty\
   (r[-e]*s[i^]p`r[-o]*k[a^]l"[i^]*t[y^]), n.
   The quality or condition of being reciprocal; reciprocalness.
   [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

reciprocality
    n 1: a relation of mutual dependence or action or influence
         [syn: reciprocality, reciprocity]