, in Surveying, a square measure, being the 40th part of a rood, or the 160th part of an acre; that is, the square of a pole or rod, of the length of 5 1/2 yards, or 16 1/2 feet.
Perch is by some also made to mean a measure of length; being the same as the rod or pole of 5 1/2 yards or 16 1/2 feet long. But it is better, for preventing confusion, to distinguish them.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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