
(from the article `papermaking`) Weight or substance per unit area, called basis weight, is a fundamental property of paper and paperboard products. From the first uses of paper in ...
Found on
http://www.britannica.com/eb/a-z/b/28

Weight in pounds of a ream of paper cut to the basic size for its grade.
Found on
http://www.e-printing.co.uk/glossary.htm

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 25'x38' for 500 sheets; therefore, 500 sheets of 70lb. offset book paper in 25'x38' will actua...
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http://www.encyclo.co.uk/local/20829

The weight of paper defined in grams per square metre (g/m2).
Found on
http://www.encyclo.co.uk/local/21179

Basis or basic weight refers to the weight, in pounds, of a ream (500 sheets) of paper cut to a given standard size for that particular paper grade.
Found on
https://www.encyclo.co.uk/local/22539
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