Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A barrier to communication, understanding, or action.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a fortification 1,500 miles long built across northern China in the 3rd century BC; it averages 6 meters in width

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[After the Great Wall of China.]

Examples

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