O"pen*ness, n. The quality or state of being open.

• (Social) liberal attitude or opinion, as in receptivity to new ideas, behaviors, cultures, peoples, environments, experiences, etc., different from the familiar, conventional, traditional, or one's own.
  
• The degree to which a person, group, organization, institution, or society exhibits this liberal attitude or opinion.
  
• (computing) degree of accessibility to view, use, and modify computer code in a shared environment with legal rights generally held in common and preventing proprietary restrictions on the right of others to continue viewing, using, modifying and sharing that code.
  
• (Systems) the degree to which a system operates with distinct boundaries across which exchange occurs capable of inducing change in the system while maintaining the boundaries themselves.