"openness" in the noun sense
1. openness
without obstructions to passage or view
"the openness of the prairies"
2. openness, nakedness
characterized by an attitude of ready accessibility (especially about one's actions or purposes without concealment not secretive
3. receptiveness, receptivity, openness
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"
Source: WordNet® (An amazing lexical database of English)
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