1. 
[syn: receptiveness, receptivity, openness]
The Collaborative International Dictionary of English v.0.48:
Receptiveness \Re*cep"tive*ness\, n.
   The quality of being receptive.
   [1913 Webster]
WordNet (r) 3.0 (2006):
receptiveness
    n 1: willingness or readiness to receive (especially impressions
         or ideas); "he was testing the government's receptiveness
         to reform"; "this receptiveness is the key feature in
         oestral behavior, enabling natural mating to occur"; "their
         receptivity to the proposal" [syn: receptiveness,
         receptivity, openness]