What is Imposition?

Legal Definition
Imposition is one of the fundamental steps in the prepress printing process. It consists in the arrangement of the printed product’s pages on the printer’s sheet, in order to obtain faster printing, simplify binding and reduce paper waste.

Correct imposition minimizes printing time by maximizing the number of pages per impression, reducing cost of press time and materials. To achieve this, the printed sheet must be filled as fully as possible.
-- Wikipedia
Legal Definition
An impost; tax; contribution. Paterson v. Society, 24 N. J. Law, 400; Singer Mfg. Co. v. Heppenheimer, 58 N. J. Law, 633, 34 Atl. 1061, 32 In R. A. 643.
-- Black's Law Dictionary
Legal Definition
Imposts, taxes, or contributions.
-- Bouviers Law Dictionary
Legal Definition
An impost; a tax; a tribute. See 24 N. J. L. 385.
-- Ballentine's Law Dictionary