1) Avoidance 2) Ban 3) Exclusion 4) Forestalling 5) Hindrance 6) Obviation 1) Forestalling 2) Obviation 3) Prevention 
• (n.) The act of precluding, or the state of being precluded; a shutting out.
Pre·clu'sion noun [ Latin praeclusio . See Preclude .] The act of precluding, or the state of being precluded; a shutting out. 
preclusion 1. The act of preventing something by anticipating and disposing of it effectively. 2. The act of shutting out or preventing from access or possession of something. 3. The state of being prevented from entering the possession or enjoyment of something.