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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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Examples
Here, the barrier winds down a narrow alleyway used 350 years ago by sisters to drive cows out to pasture.
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.
Either way achieves the objective of inserting a non-stick barrier between the laminate and the release paper.
Calendula helps to heal broken skin, and the oil in the salve creates a protective barrier that prevents mucous membranes from drying out.
In America, barrier walls are built along highways to keep neighbors from being inconvenienced by the noise.
Michael understood that he would never fully absorb the French experience if language were a barrier.

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