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c.1300, "an ordinance to fix the amount of a payment or tax," from Old French sise, shortened form of assise "session, assessment, regulation, manner" (see assize), probably a misdivision of l'assise as la sise. The sense of "extent, amount, volume, magnitude" (c.1300) is from the notion of regulating something by fixing the amount of it (weights, food portions, etc.). Specific sense of "set of dimensions of a manufactured article for sale" is attested from 1590s.
coating with a gelatinous or other substance to add strength or stiffness or to reduce absorbency. In the visual arts, a canvas or panel is prepared for painting by applying size, a dilute mixture of glue or a resinous substance. In oil painting it is essential that the canvas be coated with size so that its absorbency is reduced and contact with the paint, which would lead ultimately to the decay of the canvas fibre, is avoided. Hide glue is most frequently used to treat canvas, having largely replaced parchment size, which was recommended by the 14th-century Italian artist and writer Cennino Cennini.