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Noun: barrier  ber-ee-ur [N. Amer], ba-ree-u(r) [Brit]
  1. A structure or object that impedes free movement
  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

Derived forms: barriers

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

Encyclopedia: Barrier, Michael