To print on the second side of a sheet already printed on one side.

To adjust an image on one side of a sheet so that it aligns back-to-back with an image on the other side.

Copy pasted up on the mounting oard of a mechanical, as compared to overlay art. Also called base mechanical.

Negative made by photographing base art.

The standard size of sheets of paper used to calculate basis weight in the United States and Canada.

In the United States and Canada, the weight, in pounds, of a ream (500 sheets) of paper cut to the basic size. Also called ream weight and substance weight (sub weight). In countries using ISO paper sizes, the weight, in grams, of one square meter of paper. Also called grammage and ream weight.

Usually in the book arena, but not exclusively, the joining of leafs or signatures together with either wire, glue or other means.

Usually a department within a printing company responsible for collating, folding and trimming various printing projects.

Category of paperboard ranging in thickness from 15 to 48 points.

Rubber-coated pad, mounted on a cylinder of an offset press, that receives the inked image from the plate and transfers it to the surface to be printed.

Printing that extends to the edge of a sheet or page after trimming.

A page number not printed on the page. (In the book arena, a blank page traditionally does not print a page number.)