Dictionary.net

characterized by an attitude of ready accessibility esp about one's actions or purposes; not secretive

willingness or readiness to receive (especially impressions or ideas); "he was testing the government's receptiveness to reform"; "this receptiveness is the key feature is oestral behavior, enabling natural mating to occur".

characterized by an attitude of ready accessibility (especially about one's actions or purposes); not secretive

The state of being open.

The quality or condition of being open; freedom from secrecy or obscurity; plainness; mildness, as applied to weather.

n. Quality, state, or condition of being open.