Accordion Fold: bindery term, two or more parallel folds which open like an accordion, also known as concertina fold.

Acetate: a transparent sheet placed over artwork allowing the artist to write instructions or indicate where second colour is to be placed.

Addendum: supplementary material additional to the main body of a book and printed separately at the start or end of the text.

Adhesive Binding: style of threadless binding in which the leaves of a book are held together at the binding edge by glue or synthetic adhesive and suitable lining

ADSL: Asymmetric Digital Subscriber Line. A service offering a faster internet connection than a standard dial-up or ISDN connection.

Against the Grain: Folding at right angles to the grain direction of the paper being used, as opposed to with the grain. Also called across the grain and cross-grain.  This can cause cracking on heavier papers unless the paper is scored or creased.

Airbrush: a mechanical painting tool producing an adjustable spray of paint driven by compressed air. Used in illustration design and photographic retouching.

Alphabet (length or width): the measurement of a complete set of lower case alphabet characters in a given type size expressed in points or picas.

Anodised Plate: an offset printing plate with a specially treated surface to reduce wear during printing.

Art Paper: a smooth coated paper obtained by adding a coating of china clay compound on one or both sides of the paper.

Ascender: In typesetting, the part of a lower case letter which rises above the main body, as in the letter “b”.

ASCII: American Standard Code for Information Interchange. This is a standard coding system within the computer industry to convert keyboard input into digital information. It covers all of the printable characters in normal use and control characters such as carriage return and line feed. The full table contains 127 elements. Variations and extensions of the basic code are to be found in special applications.

Author’s Corrections: Corrections made by the author on proofs, that alter the original copy. Author’s corrections are chargeable at the discretion of the printer.