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The weight, in pounds, of a ream (500 sheets) of paper cut to a given standard (basic size). Each major paper grade, like cover, bond, or offset, has its own basic sheet size, which determines its basis weight. For example, the basic size of book paper is 25x38 for 500 sheets; therefore, 500 sheets of 70lb. offset book paper in 25x38 will actually weigh 70 pounds. See also basic size, weight.
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