What is a barrier?

What is a barrier? Here are some definitions.

Noun
  1. A structure that bars passage.
  2. An obstacle or impediment.
  3. A boundary or limit.
  4. (grammar) A node (in government and binding theory) said to intervene between other nodes A and B if it is a potential governor for B, c-commands B, and does not c-command A.
  5. (physiology) A separation between two areas of the body where specialized cells allow the entry of certain substances but prevent other substances to enter.
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He aced the 226-yard eighth hole with a four-iron in a front nine of 29 that had him on course to break the magical 60 barrier.
Here, the barrier winds down a narrow alleyway used 350 years ago by sisters to drive cows out to pasture.
Either way achieves the objective of inserting a non-stick barrier between the laminate and the release paper.
Non-ionic surfactants act as accelerators of diffusion in the cuticular wax barrier.
Not only can these techniques represent a usability issue to able bodied users they can present an impenetrable barrier to less abled visitors.
The role of the geosphere itself as a chemical containment barrier is relatively difficult to evaluate.

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