square inch

a unit of area measurement equal to a square measuring one inch on each side; 6.452 square centimeters. Abbreviation: in 2 , sq. in.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Also, the water pressure is such that roughly the weight of a large car is
  borne by each individual square inch of surface area.
Every square inch that could hold a single plant of millet was planted.
More pixels per square inch generally means a sharper picture for
  movie-watching and clearer text for reading.
It's thousands of pounds per square inch coming up the hole.
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