1. A structure or object that impedes free movement
   "The concrete barrier prevented cars from crossing into oncoming traffic"
    
2. Any condition that makes it difficult to make progress or to achieve an objective
   "intolerance is a barrier to understanding";
   - roadblock
    
3. Anything serving to maintain separation by obstructing vision or access
   "The sound barrier helped reduce noise from the highway"

Derived forms: barriers

Type of: impediment, impedimenta, mechanism, obstacle, obstructer, obstruction, obstructor

Encyclopedia: Barrier, Michael