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witness corner

noun Surveying.
  1. a point, marked by a monument, situated at a known distance from and bearing relative to a corner that is used as a reference point but on which it is impossible to place a monument.Compare corner(def 10a).
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Origin of witness corner

An Americanism dating back to 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018